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IIFENews
Senior Care News

IIFE

在ES5中为了避免全局污染所用的手法。 (function () { var sum = 0; for (var i = 0; i <= 100; i++) { sum += i; } console.log(sum); })();

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Js箭头函数News
Senior Care News

Js箭头函数

ES5 let show = function () { console.log("show"); } show() ES6箭头函数 let show = () => { console.log("show"); } show() 当形式参数只有一个的时候，可以省略（） ...

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阻止事件传播News
Senior Care News

阻止事件传播

<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title></title> <style> button { border: 0; w...

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JS删除指定数组元素News
Senior Care News

JS删除指定数组元素

//封装函数删除数组中所有的指定的数字 let arr1 = ; //定义函数 const deleteNum = (arr, num) => { //判断传入值是否为数组 if (arr instanceof Array) { arr.splice(arr.indexO...

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如何网页加载完成才执行JSNews
Senior Care News

如何网页加载完成才执行JS

使用load,可以让你想要加载的东西放到最后。 window.addEventListener("load", function () { 执行代码 }) 比如图片，当网页一开始的时候，不渲染某些图片，这会导致网页加载速度变慢，我们可以先让网页整体框架加载出来，然后再慢慢加载图片...

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JS将数组元素颠倒reverseNews
Senior Care News

JS将数组元素颠倒reverse

声明以下数组元素 let arr = 通过reverse可以让数组元素颠倒过,来如下效果 let s = arr.reverse(function (v) { return v }) console.log(s);

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slice区间截取News
Senior Care News

slice区间截取

有如下数组 let arr = 1.要截取从关羽到最后一位：通过下标截取，关羽的下标是1，就可以通过指定下标截取 let s = arr.slice(1) 结果 2.当我们不知道具体下标的时候可以通过indexOf()来查询下标 let s = arr.slice(arr.in...

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