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html javascript動態函式

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
    <script type="text/javascript">
       /*動態函式,函式裡面的字串可以改變*/
var add=new Function("x,y","var sum;sum=x+y;return sum");
        var sums=add(1
,2); document.write(sums); </script> </body> </html>