带有参数并返回值的函数
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<meta charset="utf-8">
<title>滴答编程(dida100.com)</title>
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<p>本例调用的函数会执行一个计算，然后返回结果：</p>
<p id="demo"></p>
<script>
function myFunction(a,b){
return a*b;
}
document.getElementById("demo").innerHTML=myFunction(4,3);
</script>
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