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<h1 id="JS变量"><a href="#JS变量" class="headerlink" title="JS变量"></a>JS变量</h1><ul>
<li><p><strong>类型</strong><br> a、值类型：Number、String、Boolean、Null、Undefined、Symbol(ECMAScript中定义)</p>
<pre><code>存在栈中(占据空间固定，按值访问)
</code></pre><p> b、引用类型:Object、Array、Function等</p>
<pre><code>存在堆中(值大小会变化，变量存储的是其指针)
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br></pre></td><td class="code"><pre><span class="line">//对象深度复制问题</span><br><span class="line">window.deepClone = function(obj){</span><br><span class="line"> var newobj = obj.constructor === Array ? [] : {};</span><br><span class="line"> if(typeof obj !== 'object'){</span><br><span class="line"> return obj;</span><br><span class="line"> } else if(window.JSON){</span><br><span class="line"> newobj = JSON.parse(JSON.stringify(obj));</span><br><span class="line"> } else {</span><br><span class="line"> for(var i in obj){</span><br><span class="line"> newobj[i] = typeof obj[i] === 'object' ? deepClone(obj[i]) : obj[i]; </span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line"> return newobj;</span><br><span class="line">};</span><br></pre></td></tr></table></figure>
</code></pre><p> c、判断</p>
<pre><code>1、typeof [{},[],null,new Function(),new Date()] // object
能有效判断string,number,symbol,boolean,undefined,function
2、A instanceof B 判断A是否B的实例
[] instanceof Array; //true
[] instanceof Object; //true
注意网页中多个框架(iframe)情况,各自有不同的构造函数
ES5提供了Array.isArray(arr)方法确认某个对象本身是否为Array类型
3、constructor 在Fn的prototype属性下并指向Fn本身(只能函数和其直接构造函数)
null,undefined不存在constructor,
constructor不稳定,当重写prototype后，原有的constructor引用会丢失，constructor会默认为Object
var f = new F();
f.constructor === F //true 因为f是F的实例，F.prototype上的constructor传递到了f上
4、toString
对于Object对象，直接调用toString()，就能返回字符串[object Object]，其他需要用call/apply
Object.prototype.toString() ; // [object Object]
Object.prototype.toString.call('') ; // [object String]
Object.prototype.toString.call(new RegExp()) ; // [object RegExp]
Object.prototype.toString.call(document) ; // [object HTMLDocument]
Object.prototype.toString.call(window) ; //[object global] window 是全局对象global的引用
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br></pre></td><td class="code"><pre><span class="line">function type(sth){</span><br><span class="line"> var ty=Object.prototype.toString.call(sth);</span><br><span class="line"> var res=ty.slice(8,ty.length-1);</span><br><span class="line"> return res;</span><br><span class="line">}</span><br><span class="line">var o={};</span><br><span class="line">var arr=[1,2];</span><br><span class="line">console.log(type(o)); // Object 实测object也可调用call判断</span><br><span class="line">console.log(type(arr)); // Array</span><br></pre></td></tr></table></figure>
</code></pre><p> d、<a href="https://www.cnblogs.com/onepixel/p/5126046.html" target="_blank" rel="noopener">原文链接</a>参考</p>
</li>
<li><p><strong>计算</strong><br> 强制类型转换</p>
<pre><code><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br></pre></td><td class="code"><pre><span class="line">//字符串拼接</span><br><span class="line">var a=10+10 // 20</span><br><span class="line">var b=10+'10' // 1010</span><br><span class="line">//==</span><br><span class="line">100 == '100' // true</span><br><span class="line">0 == '' // true</span><br><span class="line">null == undefined //true</span><br><span class="line">//if判断(除以下六种情况，全部转换为true)</span><br><span class="line">if(undefined || null || 0 || NaN || '' || false){</span><br><span class="line"> alert(true);</span><br><span class="line">}</span><br><span class="line"></span><br><span class="line">// === 和 == 使用,除以下情况外，尽量全部用 ===</span><br><span class="line">if(obj.a == null){</span><br><span class="line"> //jquery源码写法，相当于(obj.a === null || obj.a === undefined)</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
</code></pre></li>
<li><p><strong>JS内置函数及对象</strong><br> 函数：Object,Array,Boolean,Number,String,Function,Date,RegExp,Error等<br> 对象：JSON,Math</p>
<pre><code>JSON.stringify({a:10,b:20}) //对象转字符串
JSON.parse('{"a":10,"b":20}') //字符串转对象
</code></pre><p> 数组API：</p>
<pre><code>forEach 遍历所有元素
every 判断所有元素是否都符合条件
some 判断是否有元素符合条件
sort 排序
map 对元素重新组装，生成新数组
filter 过滤符合条件的元素
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br></pre></td><td class="code"><pre><span class="line">var arr = [1,3,2];</span><br><span class="line">arr.forEach(function(item,index){</span><br><span class="line"> console.log(index,item);</span><br><span class="line">})</span><br><span class="line">var res = arr.every(function(item,index){</span><br><span class="line"> if(item < 4){</span><br><span class="line"> return ture; //若所有元素都小于4，返回true</span><br><span class="line"> }</span><br><span class="line">})</span><br><span class="line">console.log(res); //true</span><br><span class="line">var res = arr.some(function(item,index){</span><br><span class="line"> if(item < 2){</span><br><span class="line"> return ture; //若有元素小于2，返回true</span><br><span class="line"> }</span><br><span class="line">})</span><br><span class="line">console.log(res); //true</span><br><span class="line">arr.sort(function(a,b){ //此方法会改变自身</span><br><span class="line"> //从小到大（默认）</span><br><span class="line"> return a - b;</span><br><span class="line"> //从大到小</span><br><span class="line"> //return b - a;</span><br><span class="line">})</span><br><span class="line">console.log(arr); //[1,2,3]</span><br><span class="line">var arrm = arr.map(function(item,index){ //此方法返回新数组，原数组不变</span><br><span class="line"> return '<h1>' + item + '</h1>';</span><br><span class="line">})</span><br><span class="line">console.log(arr); //[1,2,3]</span><br><span class="line">console.log(arrm); //["<h1>1</h1>","<h1>2</h1>","<h1>3</h1>"]</span><br><span class="line">var arrf = arr.filter(function(item,index){ //此方法返回新数组，原数组不变</span><br><span class="line"> if(item >= 2){</span><br><span class="line"> return true;</span><br><span class="line"> }</span><br><span class="line">})</span><br><span class="line">console.log(arr); //[1,2,3]</span><br><span class="line">console.log(arrf); //[2,3]</span><br></pre></td></tr></table></figure>
</code></pre><p> 对象API：</p>
<pre><code><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br></pre></td><td class="code"><pre><span class="line">var obj = {</span><br><span class="line"> x:1,</span><br><span class="line"> y:2,</span><br><span class="line"> z:3</span><br><span class="line">}</span><br><span class="line">var key;</span><br><span class="line">for(key in obj){</span><br><span class="line"> if(obj.hasOwnProperty(key)){</span><br><span class="line"> console.log(key,obj[key]);</span><br><span class="line"> }</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
</code></pre></li>
</ul>
<h1 id="原型"><a href="#原型" class="headerlink" title="原型"></a>原型</h1><ul>
<li><p><strong>构造函数</strong></p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br></pre></td><td class="code"><pre><span class="line">function Foo(name){ //构造函数一般大写</span><br><span class="line"> this.name = name;</span><br><span class="line"> this.other = 'otherAttr';</span><br><span class="line"> // return this //默认有此行</span><br><span class="line">}</span><br><span class="line">var f = new Foo('zhangsan');</span><br><span class="line">//new Foo()的时候，Foo里面的this变为空对象，属性赋值后返回this(this指向创建的新对象f)</span><br><span class="line">f instanceof Foo //判断f的直接构造函数是否为Foo</span><br></pre></td></tr></table></figure>
</li>
<li><p><strong>原型规则</strong><br> 所有引用类型(数组，对象，函数)，都有对象特性：可自由扩展属性<br> 所有引用类型(数组，对象，函数)，都有__proto__属性：属性值是普通对象<br> 所有的函数，都有一个prototype属性：属性值是普通对象<br> 所有引用类型(数组，对象，函数)，__proto__属性值指向它的构造函数的”prototype”属性值<br> 当试图得到一个对象的某个属性时，如果这个对象本身没有这个属性，那么会去它的__proto__(即它构造函数的prototype)中找</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br></pre></td><td class="code"><pre><span class="line">循环遍历自身属性</span><br><span class="line">var item;</span><br><span class="line">for(item in foo){</span><br><span class="line"> //高级浏览器已经在for in中屏蔽了来自原型的属性，但还是建议加上以下判断</span><br><span class="line"> if(foo.hasOwnProperty(item)){</span><br><span class="line"> console.log(item);</span><br><span class="line"> }</span><br><span class="line">}</span><br><span class="line">//原型继承实例，封装DOM查询</span><br><span class="line">function Emt(id){</span><br><span class="line"> this.emt = document.getElementById(id);</span><br><span class="line">}</span><br><span class="line">Emt.prototype.html = function(val){</span><br><span class="line"> var emt = this.emt;</span><br><span class="line"> if(val){</span><br><span class="line"> emt.innerHTML = val;</span><br><span class="line"> return this //此句可用于链式操作</span><br><span class="line"> }else{</span><br><span class="line"> return emt.innerHTML;</span><br><span class="line"> }</span><br><span class="line">}</span><br><span class="line">Emt.prototype.on = function(type,fn){</span><br><span class="line"> var emt = this.emt;</span><br><span class="line"> emt.addEventListener(type,fn);</span><br><span class="line"> return this //此句表示其后还可跟链式调用</span><br><span class="line">}</span><br><span class="line">var div1 = new Emt('div1');</span><br><span class="line">//console.log(div1.html());</span><br><span class="line">//链式操作</span><br><span class="line">div1.html('<h1>Hello</h1>').on('type',function(){</span><br><span class="line"> alert('clicked');</span><br><span class="line">})</span><br></pre></td></tr></table></figure>
</li>
</ul>
<h1 id="作用域和闭包"><a href="#作用域和闭包" class="headerlink" title="作用域和闭包"></a>作用域和闭包</h1><ul>
<li><p><strong>执行上下文</strong><br> 范围：一段< script>或一个函数<br> 全局：变量定义、函数声明 （一段< script>）<br> 函数：变量定义、函数声明、this、arguments （函数）<br> 执行前，变量定义和函数声明被提前，this要在执行时才能确认</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br></pre></td><td class="code"><pre><span class="line">var a = {</span><br><span class="line"> name:'A';</span><br><span class="line"> fn:function(){</span><br><span class="line"> console.log(this.name);</span><br><span class="line"> }</span><br><span class="line">}</span><br><span class="line">a.fn() //this === a</span><br><span class="line">a.fn().call({name:'B'}) //this ==={name:'B'}</span><br><span class="line">var fn1 = a.fn</span><br><span class="line">fn1() // this === window</span><br></pre></td></tr></table></figure>
<p> this:作为构造函数执行，作为对象属性执行，作为普通函数执行（window），call apply bind</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre></td><td class="code"><pre><span class="line">//call,apply,bind都能改变this指向(bind必须用函数表达式形式)</span><br><span class="line">var fn2 = function(name){</span><br><span class="line"> alert(name);</span><br><span class="line"> console.log(this) //this === {y:20}</span><br><span class="line">}.bind({y:20})</span><br><span class="line">fn2('zhangsan')</span><br></pre></td></tr></table></figure>
</li>
<li><p><strong>作用域</strong><br> 无块级，只有函数和全局作用域</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br></pre></td><td class="code"><pre><span class="line">if(true){</span><br><span class="line"> var name = 'zhangsan'; //name不属于if代码块私有，在if外面能访问到此变量</span><br><span class="line">}</span><br><span class="line">console.log(name) //zhangsan</span><br><span class="line">var a = 100; //全局变量</span><br><span class="line">var b = 200;</span><br><span class="line">function fn(){</span><br><span class="line"> var a = 200; //函数内部变量，与全局变量a互不影响</span><br><span class="line"> console.log('fn',a); // fn 200</span><br><span class="line"> //b在此函数作用域中未定义(会去父级作用域找)，它是自由变量</span><br><span class="line"> console.log(b); // 200</span><br><span class="line">}</span><br><span class="line">console.log('global',a); // global 100</span><br><span class="line">fn();</span><br></pre></td></tr></table></figure>
</li>
<li><p><strong>闭包</strong></p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br></pre></td><td class="code"><pre><span class="line">//函数作为返回值</span><br><span class="line">function F1(){</span><br><span class="line"> var a = 100;</span><br><span class="line"> return function(){</span><br><span class="line"> console.log(a); //100</span><br><span class="line"> }</span><br><span class="line">}</span><br><span class="line">var f1 = F1();</span><br><span class="line">var a = 200;</span><br><span class="line">f1(); //100</span><br><span class="line">//函数作为参数传递</span><br><span class="line">function F2(fn){</span><br><span class="line"> var a = 200;</span><br><span class="line"> fn();</span><br><span class="line">}</span><br><span class="line">F2(f1); //100</span><br></pre></td></tr></table></figure>
</li>
<li><p><strong>异步和单线程</strong></p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br></pre></td><td class="code"><pre><span class="line">//同步会阻塞程序运行(区别与异步)</span><br><span class="line">console.log(1);</span><br><span class="line">alert(2); //程序在此卡住，什么时候点击，什么时候继续</span><br><span class="line">console.log(3)</span><br><span class="line">//异步不会阻塞</span><br><span class="line">console.log(1);</span><br><span class="line">setTimeout(function(){ //程序跳过定时任务，继续执行后面代码，空闲时提出来执行</span><br><span class="line"> console.log(2);</span><br><span class="line">},1000)</span><br><span class="line">console.log(3);</span><br></pre></td></tr></table></figure>
<p> 单线程特点：一次只能干一件事<br> 在可能发生等待的情况并且等待过程不能像alert一样阻塞程序运行的时候需要异步</p>
<pre><code>定时任务：setTimeout，setInterval
网络请求：ajax请求，动态<img>加载
事件绑定
</code></pre><h1 id="JS-Web-API"><a href="#JS-Web-API" class="headerlink" title="JS-Web-API"></a>JS-Web-API</h1></li>
<li><strong>JS基础</strong><br> ECMA262标准<pre><code>类型，原型，作用域，异步
</code></pre> 特点：表面看并不能用于工作中开发代码</li>
<li><strong>JS-web-api</strong><br> W3C标准中关于JS的规定有：<pre><code>DOM操作
BOM操作
事件绑定
ajax请求(包括http协议)
存储
</code></pre> JS内置全局函数和对象<pre><code>JS变量中提到的和window，document,navigator等
</code></pre></li>
<li><strong>JS(浏览器执行的JS)构成</strong><br> JS基础（ECMA262标准）<br> JS-web-api（W3C标准）<br> (服务器执行的js，如nodejs包含”ECMA262标准”,但不包含”W3C标准”)</li>
<li><p><strong>DOM</strong><br> 本质：浏览器把拿到的html文件结构化成浏览器和JS都可识别的模型，即为DOM<br> 数据结构：树结构<br> 节点操作：</p>
<pre><code>获取DOM节点
document.getElementById('id') //元素
document.getElementsByTagName('body')[0]; //集合
document.getElementsByClassName('.con'); //集合
document.querySelectorAll('p'); //集合
prototype(JS对象属性)
var pList = document.querySelectorAll('p');
var p = pList[0]; //p为js对象
console.log(p.style.width); //获取样式
p.style.width = '100px'; //修改样式
console.log(p.className); //获取class
p.className = 'p1'; //修改class
//获取nodeName和nodeType
console.log(p.nodeName); //P
console.log(p.nodeType);
Attribute(改html文档标签属性)
var pList = document.querySelectorAll('p');
var p = pList[0]; //p为js对象
p.getAttribute('data-name');
p.setAttribute('data-name','imooc');
p.getAttribute('style');
p.setAttribute('style','font-size:30px;');
</code></pre><p> 结构操作：</p>
<pre><code><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br></pre></td><td class="code"><pre><span class="line">//新增节点</span><br><span class="line">var div1 = document.getElementById('div1');</span><br><span class="line">var p1 = document.createElement('p'); //创建新节点</span><br><span class="line">p1.innerHTML = 'this is p1';</span><br><span class="line">div1.appendChild(p1); //添加新节点到div1</span><br><span class="line">var p2 = document.getElementById('p2');</span><br><span class="line">div1.appendChild(p2); //移动已存在的节点p2到div1</span><br><span class="line">//获取父元素</span><br><span class="line">var parent = div1.parentElement;</span><br><span class="line">//获取子元素</span><br><span class="line">var child = div1.childNodes; //注意text节点</span><br><span class="line">var child = div1.childNodes[0].nodeType; // 3 (通用)</span><br><span class="line">var child = div1.childNodes[1].nodeType; // 1</span><br><span class="line">var child = div1.childNodes[0].nodeName; // #text (浏览器差异)</span><br><span class="line">var child = div1.childNodes[1].nodeName; // P</span><br><span class="line">//删除节点</span><br><span class="line">div1.removeChild(child[1]); //注意空text节点</span><br></pre></td></tr></table></figure>
</code></pre></li>
<li><p><strong>BOM</strong><br> 浏览器类型<br> 解析url<br> 内置对象</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br></pre></td><td class="code"><pre><span class="line">//navigator</span><br><span class="line">var ua = navigator.userAgent; //此信息可被浏览器公司修改，不能保证真实性</span><br><span class="line">console.log(ua); //"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/65.0.3325.162 Safari/537.36"</span><br><span class="line">var isChrome = ua.indexOf('Chrome'); //简单判断浏览器</span><br><span class="line">//screen(获取屏幕像素，与浏览器缩放比有关，不同浏览器又有差异)</span><br><span class="line">console.log(screen.width); //1920(Edge,100%), 1536(Edge,125%), 1536(Chrome,控制台下调整缩放比无效)</span><br><span class="line">console.log(screen.height); //1080(Edge,100%), 864(Edge,125%), 864(Chrome)</span><br><span class="line">//location(浏览器会将url中的中文编码，以谷歌搜索vuejs为例，自定义hash：#123)</span><br><span class="line">console.log(location.href); // https://www.google.com/search?q=vuejs&oq=vuejs&aqs=chrome..69i57j0j35i39j0l2j69i65.1977j0j8&sourceid=chrome&ie=UTF-8#123</span><br><span class="line">console.log(location.protocol); // https:</span><br><span class="line">console.log(location.host); // www.google.com</span><br><span class="line">console.log(location.pathname); // /search</span><br><span class="line">console.log(location.search); // ?q=vuejs&oq=vuejs&aqs=chrome..69i57j0j35i39j0l2j69i65.1977j0j8&sourceid=chrome&ie=UTF-8</span><br><span class="line">console.log(location.hash); // #123</span><br><span class="line">//history</span><br><span class="line">history.back(); //前进</span><br><span class="line">history.forward(); //后退</span><br></pre></td></tr></table></figure>
</li>
<li><p><strong>事件</strong><br> 通用事件绑定：</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br></pre></td><td class="code"><pre><span class="line">var btn = document.getElementById('btn1');</span><br><span class="line">//IE低版本使用attachEvent绑定事件</span><br><span class="line">btn.addEventListener('click',function(event){</span><br><span class="line"> console.log('clicked');</span><br><span class="line">})</span><br><span class="line">function bindEvent(ele,type,fn){</span><br><span class="line"> ele.addEventListener(type,fn);</span><br><span class="line">}</span><br><span class="line">var a = docunment.getElementById('link1');</span><br><span class="line">bindEvent(a,'click',function(e){</span><br><span class="line"> e.preventDefault(); //阻止默认事件</span><br><span class="line"> e.stopPropatation(); //阻止事件冒泡</span><br><span class="line"> alert('clicked');</span><br><span class="line">})</span><br></pre></td></tr></table></figure>
<p> 事件冒泡(默认)</p>
<pre><code>Element.addEventListener('click',fn,false); //第三个参数不写默认为false，即默认冒泡
点击子元素，会依次触发自身和父级元素的对应事件
e.stopPropatation(); //阻止事件冒泡
</code></pre><p> 事件捕获</p>
<pre><code>Element.addEventListener('click',fn,true);
点击子元素，如果父元素注册了事件捕获，则会先触发父元素事件
</code></pre><p> 代理(点击div1里面的多个a元素):代码简洁、减少浏览器内存占用</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br></pre></td><td class="code"><pre><span class="line">var div1 = document.getElementById('div1');</span><br><span class="line">div1.addEventListener('click',function(e){</span><br><span class="line"> var target = e.target; //获取点击的html元素</span><br><span class="line"> if(target.nodeName === 'A'){</span><br><span class="line"> alert(target.innerHTML)</span><br><span class="line"> }</span><br><span class="line">})</span><br></pre></td></tr></table></figure>
</li>
<li><p><strong>ajax</strong></p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br></pre></td><td class="code"><pre><span class="line">var xhr = new XMLHttpRequest;</span><br><span class="line">//open方法</span><br><span class="line">xhr.open('get,'/api',true); //默认异步true</span><br><span class="line">xhr.send(null);</span><br><span class="line">//post方法</span><br><span class="line">xhr.open('post','/api');</span><br><span class="line">xhr.setRequestHeader("Content-type","application/x-www-form-urlencoded");</span><br><span class="line">xhr.send('username=name&&pwd=123');</span><br><span class="line"></span><br><span class="line">xhr.onreadystatechange = function(){</span><br><span class="line"> if(xhr.readyState == 4 && xhr.status == 200){</span><br><span class="line"> alert(xhr.responseText);</span><br><span class="line"> }</span><br><span class="line">}</span><br><span class="line">//readyState=0,(未初始化)还未调用send()方法</span><br><span class="line">//readyState=1,已调用send()方法，正在发送请求</span><br><span class="line">//readyState=2,send()执行完成，已收到全部响应内容</span><br><span class="line">//readyState=3,解析相应内容</span><br><span class="line">//readyState=4,完成解析，可调用</span><br><span class="line">//status=2XX,成功处理请求，(200)</span><br><span class="line">//status=3XX,需要重定向，浏览器直接跳转</span><br><span class="line">//status=4XX,客户端请求错位，(404)</span><br><span class="line">//status=5XX,服务器端错误</span><br></pre></td></tr></table></figure>
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