4_箭头函数

P_ning

于 2021-03-30 20:20:54 发布

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分类专栏： Es6

本文链接：https://blog.youkuaiyun.com/P_ning/article/details/115334911

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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <script>
        //原本的函数
        function demo_1(a,b){
            return a+b;
        }
        console.log(demo_1(1,2));
        //简化为箭头函数
        demo_2=(a,b)=>{
            return a+b;
        }
        console.log(demo_2(1,2));
        //如果箭头函数只有一句返回值，还可以简写为
        demo_3=(a,b)=>a+b;
        console.log(demo_3(1,2));


        //利用箭头函数实现map和reduce
        let arr = [1,2,3,4];
        var map = arr.map((currentValue)=>{
            return currentValue*2;
        });
        var reduce = arr.reduce((accumulator, currentValue) => {
            return accumulator+currentValue;
        });
        console.log("map函数后得到的数组");
        console.log(map);
        console.log("reduce函数后得到的数组");
        console.log(reduce);
    </script>
</body>
</html>