教大家如何使用微信小程序数字滚动插件
本文主要和大家介绍微信小程序数字滚动插件的使用方法,具有一定的参考价值,感兴趣的小伙伴们可以参考一下,希望能帮助到大家。
用es6语法方式写了个微信小程序小插件 数字滚动;
效果图:
wxml页面布局代码:<!--pages/main/index.wxml--><view>index.js调用NumberAnimate.js// pages/main/index.jsimport NumberAnimate from "../../utils/NumberAnimate";Page({ data:{}, onLoad:function(options){// 页面初始化 options为页面跳转所带来的参数}, onReady:function(){}, onShow:function(){// 页面显示 }, onHide:function(){// 页面隐藏 },onUnload:function(){// 页面关闭}, //调用NumberAnimate.js中NumberAnimate实例化对象,测试3种效果 animate:function(){this.setData({num1:'',num2:'',num3:'',num1Complete:'',num2Complete:'',num3Complete:''});let num1 = 18362.856;let n1 = new NumberAnimate({from:num1,//开始时的数字speed:2000,// 总时间refreshTime:100,// 刷新一次的时间decimals:3,//小数点后的位数onUpdate:()=>{//更新回调函数this.setData({num1:n1.tempValue});},onComplete:()=>{//完成回调函数this.setData({num1Complete:" 完成了"});}});let num2 = 13388;let n2 = new NumberAnimate({from:num2,speed:1500,decimals:0,refreshTime:100,onUpdate:()=>{this.setData({num2:n2.tempValue});},onComplete:()=>{this.setData({num2Complete:" 完成了"});}});let num3 = 2123655255888.86;let n3 = new NumberAnimate({from:num3,speed:2000,refreshTime:100,decimals:2,onUpdate:()=>{this.setData({num3:n3.tempValue});},onComplete:()=>{this.setData({num3Complete:" 完成了"});}}); }})NumberAnimate.js代码: /** * Created by wangyy on 2016/12/26. */'use strict';class NumberAnimate {constructor(opt) {let def = {from:50,//开始时的数字speed:2000,// 总时间refreshTime:100,// 刷新一次的时间decimals:2,// 小数点后的位数onUpdate:function(){}, // 更新时回调函数onComplete:function(){} // 完成时回调函数}this.tempValue = 0;//累加变量值this.opt = Object.assign(def,opt);//assign传入配置参数this.loopCount = 0;//循环次数计数this.loops = Math.ceil(this.opt.speed/this.opt.refreshTime);//数字累加次数this.increment = (this.opt.from/this.loops);//每次累加的值this.interval = null;//计时器对象this.init();}init(){this.interval = setInterval(()=>{this.updateTimer()},this.opt.refreshTime);}updateTimer(){this.loopCount++;this.tempValue = this.formatFloat(this.tempValue,this.increment).toFixed(this.opt.decimals);if(this.loopCount >= this.loops){clearInterval(this.interval);this.tempValue = this.opt.from;this.opt.onComplete();}this.opt.onUpdate();}//解决0.1+0.2不等于0.3的小数累加精度问题formatFloat(num1, num2) {let baseNum, baseNum1, baseNum2;try {baseNum1 = num1.toString().split(".")[1].length;} catch (e) {baseNum1 = 0;}try {baseNum2 = num2.toString().split(".")[1].length;} catch (e) {baseNum2 = 0;}baseNum = Math.pow(10, Math.max(baseNum1, baseNum2));return (num1 * baseNum + num2 * baseNum) / baseNum;};}export default NumberAnimate;相关推荐:
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