刚学习vue不久,今天试着用vue做了一个简单的loading进度条,对于vue的生命周期和钩子函数又有了新的理解,下面分享给大家,绝对入门级。
一、进度条原理
这个就很简单了,也是我们经常可以用到的,这里只做一个最简单的,页面刷新自动加载进度条。主要是让进度条的width不断增加至100%就可以啦~好了,进入正题。
二、jquery实现
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta content="width=device-width, initial-scale=1"> <link href="https://cdn.bootcss.com/foundation/5.5.3/css/foundation.min.css" > <link href="https://static.runoob.com/assets/foundation-icons/foundation-icons.css" > <title>jq进度条</title> </head> <body> <div> <div> <span>0%</span> </div> </div> <script src="https://cdn.bootcss.com/vue/2.4.4/vue.min.js"></script> <script src="https://cdn.bootcss.com/jquery/2.1.1/jquery.min.js "></script> <script src="https://cdn.bootcss.com/foundation/5.5.3/js/foundation.min.js "></script> <script> $(function () { var html = $('.meter'); var htmlW = $('.meter').val(); var styleW = parseInt($('.meter').css('width')); var clearInt = setInterval(function () { styleW++; var styleWW = styleW + '%'; html.css('width', styleWW); html.html(styleWW); if (styleW == 100) { clearInterval(clearInt); } }, 20) }) </script> </body> </html>
三、vue实现
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta content="width=device-width, initial-scale=1.0"> <meta http-equiv="X-UA-Compatible" content="ie=edge"> <title>vue进度条</title> <link href="https://cdn.bootcss.com/foundation/5.5.3/css/foundation.min.css" > <link href="https://static.runoob.com/assets/foundation-icons/foundation-icons.css" > <style> .bar{ color: #fff; text-align: center; } </style> </head> <body> <div> <div> <span :style="{width:proBar+'%',}" >{{proBar}}</span> </div> </div> <script src="https://cdn.bootcss.com/vue/2.4.4/vue.min.js"></script> <script src="https://cdn.bootcss.com/jquery/2.1.1/jquery.min.js "></script> <script src="https://cdn.bootcss.com/foundation/5.5.3/js/foundation.min.js "></script> <script> var app = new Vue({ el: '#app', data: { proBar: 0, }, created(){ this.change(); }, methods: { change: function() { var clearInt = setInterval(function() { app.proBar++; console.log(app.prpBar); if (app.proBar == 100) { clearInterval(clearInt); } }, 20) } } }) </script> </body> </html>
对比两段代码显然vue要方便许多,因为是双向绑定,不用来回操作dom,就很简单省心啦。
注意问题:刚开始没有实现loading效果,主要是因为用了mounted钩子函数来调用change方法(还是对生命周期理解的不到位)。实现loading效果我们需要在页面加载时自动调用change方法,所以我们应该在数据全部初始化前就执行这一操作。mounted时期已经全部完成初始化,所以便不会成功。