<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>JavaScrip函数表达式</title>
</head>
<body>
<script>
// //函数体
//function sum(x,y) {
// return x+y;
//}
//函数表达式来声明一个函数，匿名函数
var sum = function (x,y) {
return x+y;
}
var a = sum(10,58);//4,5是实参，实际参数
//弹窗
// alert(a);
//直接输出到HTML文档，当前页面
//document.write(a)
//直接向控制台输出
console.log(a);
</script>
</body>
</html>
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