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<!DOCTYPE html>
<html>
<body>
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<h2>JavaScript 函数</h2>
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<p>本例调用了一个执行计算的函数，然后返回结果：</p>
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<p id="demo"></p>
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<script>
var x = myFunction(7, 8);
document.getElementById("demo").innerHTML = x;
​
function myFunction(a, b) {
    return a * b;
}
</script>
​
</body>
</html>
​