forked from joname1/joname1.github.io
-
Notifications
You must be signed in to change notification settings - Fork 0
/
Copy pathreact-native-state.html
146 lines (133 loc) · 6.59 KB
/
react-native-state.html
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
<meta http-equiv="Cache-Control" content="no-siteapp">
<meta name="viewport" content="width=device-width, initial-scale=1, user-scalable=1, minimum-scale=1, maximum-scale=1">
<meta name="renderer" content="webkit">
<meta name="google" value="notranslate">
<meta name="robots" content="index,follow">
<link rel="shortcut icon" href="/favicon.png?v=198964">
<link rel="apple-itouch-icon" href="/favicon.png?v=198964">
<link href="https://joe-10005639.cossh.myqcloud.com/index.min.css" rel="stylesheet">
<link href="https://fonts.loli.net/css?family=Merriweather:300,700,700italic,300italic|Open+Sans:700,400" rel="stylesheet">
<link href="https://cdn.bootcss.com/prism/1.13.0/themes/prism.min.css" rel="stylesheet">
<link href="https://cdn.bootcss.com/font-awesome/4.7.0/css/font-awesome.min.css" rel="stylesheet">
<script>
var timeSinceLang = {year: ' years ago',month: ' months ago',day: ' days ago',hour: ' hours ago',minute: ' minutes ago',second: ' seconds ago'};var root = '';
</script>
<meta name="keywords" content="React Native,">
<meta name="description" content="React Native爬坑之路 03 State">
<meta name="author" content="江矿叔叔.">
<title>React Native爬坑之路 03 State</title>
<link href="/bundle/iconfont.css" rel="stylesheet">
<script src="https://joe-10005639.cossh.myqcloud.com/av.min.js"></script>
<script src='https://joe-10005639.cossh.myqcloud.com/valine.min.js'></script>
</head>
<body>
<article class="container">
<header class="header-wrap asset" style="background-image: url(https://joe-10005639.cossh.myqcloud.com/bg.jpg);">
<nav class="main-nav">
<ul class="menu vertical">
<li class="menu-item"><a href="/">Home</a></li>
<li class="menu-item"><a href="/archive.html">Archive</a></li>
<li class="menu-item"><a href="/tag.html">Tag</a></li>
<li class="menu-item"><a href="/atom.xml">RSS</a></li>
</ul>
</nav>
<div class="vertical">
<div class="header-wrap-content inner">
<h3 class="title">Stay before every beautiful thoughts.</h3>
<h3 class="subtitle">Just be nice, always think twice!</h3>
</div>
</div>
<a class="scroll-down icon-arrow-left" href="#content" data-offset="-45"><span class="hidden">Scroll Down</span></a>
</header>
<article class="main article">
<h1 class="title">React Native爬坑之路 03 State</h1>
<section class="info">
<span class="avatar" style="background-image: url(https://joe-10005639.cossh.myqcloud.com/jkbb.jpg);"></span> <a class="name" href="javascript:;">江矿叔叔.</a>
<span class="date" data-time="1521950400"><span class="from"></span></span>
<span class="tags"><a class="tages" href="/tag/React%20Native/index.html">React Native</a></span>
</section>
<article class="content"><p>State的使用方式是在组件的构造函数中初始化State，在合适的地方调用setState方法，首先来看官方的例子，官方给出了一个文字闪烁的效果：</p>
<pre><code class="language-js">class Blink extends Component {
constructor(props) {
super(props);
this.state = {showText: true};//这里设置了一个showText，默认值为true
// Toggle the state every second
setInterval(() => {
this.setState({ showText: !this.state.showText });
}, 1000);//这里是一个定时器，每1s会执行一次，调用定时器中的方法，重新给state赋值，注意this.state.showText是获取当前showText的值，同时需要注意的是调用this.setState()后回自动调用 render() 方法从而实现界面的刷新。
}
render() {
let display = this.state.showText ? this.props.text : ' ';//这里通过showText 的值决定diaplay的值，如果为ture 则显示this.props.text属性的值，否则显示‘ ’，this.props.text为自定义属性，let等同于var；
return (
<Text>{display}</Text>
);
}
}
</code></pre>
<p>在启动组件中使用</p>
<pre><code class="language-js">class BlinkApp extends Component {
render() {
return (
<View>
<Blink text='I love to blink' />
<Blink text='Yes blinking is so great' />
<Blink text='Why did they ever take this out of HTML' />
<Blink text='Look at me look at me look at me' />
</View>
);
}
}
</code></pre>
</article>
<section class="author">
<div class="avatar" style="background-image: url(https://joe-10005639.cossh.myqcloud.com/jkbb.jpg);"></div>
<a class="name" href="javascript:;">江矿叔叔.</a>
<div class="intro">前(台)端(菜), 喜欢钻研新技术.</div>
</section>
<section class="social">
<a href="https://github.com/joname1" target="_blank">
<i class="iconfont i-github"></i>
</a>
<a href="https://twitter.com/im_joname" target="_blank">
<i class="iconfont i-twitter"></i>
</a>
<a href="https://www.zhihu.com/people/joname-liangtan" target="_blank">
<i class="iconfont i-zhihu"></i>
</a>
<a href="javascript:alert('对方不想跟你讲话, 并向你扔来一段乱码 atob(decodeURI(“am9uYW1lLmxpYW5ndGFuQGdtYWlsLmNvbQ”))')" target="_blank">
<i class="iconfont i-email"></i>
</a>
</section>
<div id="comment"></div>
</article>
</article>
<footer class="footer clearfix">
<span class="copyright">
<script>
document.write(new Date().getFullYear());
</script> © Made with <i class="fa fa-heart"></i> using <Joname/>
</span>
</footer>
<script src="https://joe-10005639.cossh.myqcloud.com/index.min.js"></script>
<script src="https://cdn.bootcss.com/prism/1.13.0/prism.min.js"></script>
<script src="https://tajs.qq.com/stats?sId=59279948" charset="UTF-8"></script>
<script>
new Valine({
el: '#comment',
appId: 'jnCxgrLfxzf5aeWnhldmpset-gzGzoHsz',
appKey: 'gEclatgmn0rmGbgoFi1OuA00',
placeholder: 'ヾﾉ≧∀≦)o来啊, 快活啊!',
path: window.location.pathname,
avatar: 'retro',
pageSize: 10,
guest_info: ['nick','mail'],
lang: 'en'
})
</script>
</body>
</html>