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递归思想e
<!DOCTYPE html><html lang="en"><head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <meta http-equiv="X-UA-Compatible" content="ie=edge"> <title>D.原创 2022-03-30 13:15:54 · 111 阅读 · 0 评论 -
判断是否存在
<script type="text/javascript"> // 判断数组当中是否拥有某个元素，如果有返回true，如果没有返回false let ary = ["a", "b", "c"]; let result = ary.includes('a') console.log(result) // true 包含 result = ary.includes('e') console.log(result) // false 不包含 //includ..原创 2022-03-30 13:10:34 · 331 阅读 · 0 评论 -
闭包思想e
<!DOCTYPE html><html lang="en"><head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <meta http-equiv="X-UA-Compatible" content="ie=edge"> <title>D.原创 2022-03-30 10:10:19 · 348 阅读 · 0 评论 -
对象找值哦
<!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>D.原创 2022-03-29 13:31:19 · 309 阅读 · 0 评论 -
数组常用方法前端
<script> // forEach 迭代(遍历) 数组 var arr = [1, 2, 3]; var sum = 0; //全局变量 //value 数组元素 index数组元素的索引 array数组本身以逗号拼接 数组本身:1,2,3 arr.forEach(function(value, index, array) { console.log('每个数组元素' + .原创 2022-03-26 16:21:28 · 89 阅读 · 0 评论