案例：jQuery案例     状态：可编辑再运行    进入竖版
 运行结果　
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<!DOCTYPE html>
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<html>
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<head>
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<script src="/js/jquery-1.11.1.min.js">
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</script>
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<script>
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$(document).ready(function(){
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  $("button").on("click",function(){
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    var version = $().jquery;
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    alert("You are running jQuery version: " + version);
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  });
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});
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</script>
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</head>
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<body>
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​
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<button>显示版本号</button>
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​
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</body>
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</html>