What is jQuery.md

What is jQuery?

jQuery is a fast, small, and feature-rich JavaScript library. It makes things like HTML document traversal and manipulation, event handling, animation, and Ajax much simpler with an easy-to-use API that works across a multitude of browsers. With a combination of versatility and extensibility, jQuery has changed the way that millions of people write JavaScript.

jQuery是一个快速，小型且功能丰富的JavaScript库。借助易于使用的API（可在多种浏览器中使用），使HTML文档的遍历和操作，事件处理，动画和Ajax等事情变得更加简单。兼具多功能性和可扩展性，jQuery改变了数百万人编写JavaScript的方式。

A Brief Look简要介绍

DOM Traversal and ManipulationDOM遍历和操纵

Get the <button> element with the class 'continue' and change its HTML to 'Next Step...'

获取<button>具有“ continue”类的元素，并将其HTML更改为“ Next Step ...”。

$( "button.continue" ).html( "Next Step..." )

Event Handling事件处理

Show the #banner-message element that is hidden with display:none in its CSS when any button in #button-container is clicked.

单击任何按钮时#banner-message，显示隐藏display:none在CSS中的元素 #button-container。

var hiddenBox = $( "#banner-message" );
$( "#button-container button" ).on( "click", function( event ) {
  hiddenBox.show();
});

Ajax

Call a local script on the server /api/getWeather with the query parameter zipcode=97201 and replace the element #weather-temp's html with the returned text.

/api/getWeather 使用查询参数在服务器上调用本地脚本，并将zipcode=97201 元素#weather-temp的html替换为返回的文本。

$.ajax({
  url: "/api/getWeather",
  data: {
    zipcode: 97201
  },
  success: function( result ) {
    $( "#weather-temp" ).html( "<strong>" + result + "</strong> degrees" );
  }
});