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<!DOCTYPE html>
<html>
<body>
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<h1>JavaScript 函数</h1>
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<p>JavaScript 有一个内置的函数构造函数。</p>
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<p id="demo"></p>
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<script>
var myFunction = new Function("a", "b", "return a * b");
document.getElementById("demo").innerHTML = myFunction(4, 3);
</script>
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</body>
</html>
​