实例代码“Ctrl+/”提示“F11/ESC”全屏 返回 格式化 恢复 运行
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<!DOCTYPE html>
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<html>
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<head>
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<script src="https://libs.baidu.com/jquery/1.10.2/jquery.min.js">
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</script>
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<script>
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i=0;
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$(document).ready(function(){
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  $("input").keypress(function(){
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    $("span").text(i+=1);
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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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Enter your name: <input type="text">
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<p>Keypresses: <span>0</span></p>
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​
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</body>
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</html>