标签：document count let map head value func title console
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<head>
<meta charset="UTF-8">
<title>Document</title>
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<script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script>
<body>
<div id="app">
</div>
</body>
<script>
let arr = [1,3,55,8];
// 需求：arr数组中的所有小于5的值翻倍并求和
let count = arr.filter(function(n){
return n < 5;
}).map(function(n){
return n*2;
}).reduce(function(preValue, n){
return preValue + n;
},0);
console.log(`和：${count}`);
</script>
</html>
标签：document count let map head value func title console
原文地址：https://www.cnblogs.com/cl94/p/12246887.html
