JavaScript连载15return函数声明方式差异化回调函数

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一、return 语句

1. 注意点：（1）如果函数没有使用 return 语句，那么函数默认的返回值：undefined;（2）如果函数使用 return 语句，那么跟在 return 后面的值，就成了函数的返回值；（3）如果函数使用 return 语句，但是 return 后面没有任何值，那么函数的返回值也是 undefined;（4）推荐的做法要么让函数始终都返回一个值，要么不要有返回值。

; “ 复制代码 ”)

/\*\*

 \* 请写出一个函数用于判断一个数是不是偶数

 \* @param {number}num \*/

function isEven(num) { //1. 验证

    if(typeof num != 'number'){alert("参数不正确"); return;

    }else{if(num % 2 === 0){return '偶数';}else{return '奇数';}

    }

​

} function m1(){

​

}

isEven('100'); var f1 = isEven(45);

console.log(f1);

console.log(m1());

; “ 复制代码 ”)

二、函数直接声明和函数表达式声明的区别

1. 函数直接声明

function f(){

}

2. 函数表达式声明

var f = function{

}

​区别：JavaScript 解析器首先会把当前作用域的函数声明提前到整个作用域的最前面，所以推荐使用​函数直接声明式。​优点就是：我们的函数可以不用在乎出现的位置而​直接使用。

三、匿名函数

​1. 作用：（1）用于绑定事件的时候；（2）定时器；（3）立即执行函数。

2.

; “ 复制代码 ”)

// 匿名函数

document.onclick = function () {

    alert("youxiu");

}

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https://www.wenjuan.com/s/qaE…
https://www.wenjuan.com/s/n6z…
https://www.wenjuan.com/s/n6z…
https://www.wenjuan.com/s/FBr…
https://www.wenjuan.com/s/FBrMr2
https://www.wenjuan.com/s/Vfi…
https://www.wenjuan.com/s/Vfi…
https://www.wenjuan.com/s/MBf…
https://www.wenjuan.com/s/MBf…
https://www.wenjuan.com/s/q2A…
https://www.wenjuan.com/s/q2ABry
https://www.wenjuan.com/s/Yze…
https://www.wenjuan.com/s/Yze…

​ // 立即执行函数 

// 定时器

setInterval(function () {

    console.log("每秒爱你 300 编");

},1000);// 每个 1s 就输出一个“每秒爱你 3000 遍”
正文完
javascript
发表至： javascript
2020-06-07
 0
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