標籤：utf-8 調用 參數 執行 rip charset htm 表示 相同
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
</head>
<body>
<script type="text/javascript">
function box(){
return "我只有被調用才可以執行";//return表示把這句話字串返回回來
}
alert(box()); //調用，相當於box()="我只有被調用才可以執行"，被調用才可以執行
function box(name ,age){
return "你的姓名是:"+name+",年齡為："+age;
}
alert(box("羅桂鑫",22));
function box(name ,age){
return "你的姓名是:"+name+",年齡為："+age;
}
var str=box("羅桂鑫",22);
alert(str);
function box(){
return 10; //當一個函數遇到第一個return，就會終止函數繼續往下
return 100;
}
alert(box());
function box(){
return arguments[0]+‘|‘+arguments[1]+‘|‘+arguments[2];
}
alert(box("羅桂鑫",28,"電腦")); //輸出"羅桂鑫",28,"電腦"
function box(){
var sum=0;
for(var i=0;i<arguments.length;i++){
sum+=arguments[i];
}
return sum;
}
alert(box(10,22)); //輸出32
function box(num){
return num+100;
}
function box(num){
return num+200; //第二個函數，把第一個函數覆蓋掉了，不具備重載功能
}
alert(box(50)); //輸出250 重載就是根據參數，選擇相同函數名而參數不同的函數
</script>
</body>
</html>
js中return的用法
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