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<head>
<meta http-equiv="Content-Type" content="text/html;charset=UTF-8" />
<title>网页标题</title>
<meta name="keywords" content="关键字列表" />
<meta name="description" content="网页描述" />
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<script type="text/javascript">
/*创建一个函数，实现求外部传递进来3个数据的和，并将结果返回
function getSum(a,b,c){
return a+b+c;}
getSum(10,20,30);*/
function sum(a,b,c){
return a+b+c;
}
var s=sum(10,20,30);
document.write(s);
</script>
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