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js 数组方法 回顾
2021-08-08 02:07:06 【XFlyaa】
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<body>
</body>
<script>
let arr = [,1,2,3,,22];
console.log(arr)
// js 遍历数组
arr.forEach((item)=>{
console.log(item);
})
arr.forEach(function (){
console.log(this) // 第二个arr参数指向this
},arr)
arr.find((item)=>{
console.log(item);
})
// 返回一个新数组 原数组不变
let ary = [1,2,'a',1,2]
let ary1 = arr.filter((item,index)=>{
// 匹配数字
// return /\d+/.test(item);
return typeof item == 'number';
})
console.log(ary1)
// 返回bool 值 只要一个是true就是true
console.log(ary.some((item) => {
// return false
return typeof item == 'number';
}));
// 返回bool 值 只要有一个false就为false
console.log(ary.every((item) => {
// return false
return typeof item == 'number';
}));
let a1 = [1,2,3,4,5];
// prev 代表 return的值
console.log(a1.reduce((prev, item) => {
// console.log(prev, item);
return prev + item;
}));
</script>
</html>
版权声明
本文为[XFlyaa]所创,转载请带上原文链接,感谢
https://blog.csdn.net/qq_34608447/article/details/117376239
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