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How to implement JavaScript to calculate a value and then embed the value into html

高洛峰

Release： 2016-12-08 14:02:45

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As shown below:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>JavaScript计算值</title>
</head>
 
<body>
    <p>假设y=5,计算x=y+2,并显示结果.</p>
    <button type="button" onclick="myFunction()">点击这里</button>
    <p id="pid"></p>
     
    <script>
        function myFunction()
        {
            var y=5;
            var x=y+2;
            var demoP=document.getElementById("pid");
            demoP.innerHTML="x="+x;
        }
         
    </script>
</body>
</html>

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