案例：jquery案例     状态：可编辑再运行    进入竖版
 运行结果　
​x
 
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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"></script>
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<script>
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$(document).ready(function(){
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  $("button").click(function(){
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    var txt="";
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    txt+="Document width/height: " + $(document).width();
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    txt+="x" + $(document).height() + "\n";
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    txt+="Window width/height: " + $(window).width();
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    txt+="x" + $(window).height();
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    alert(txt);
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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>显示文档和窗口的尺寸</button>
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​
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</body>
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</html>
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​