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這篇文章主要介紹了使用小程序數(shù)字滾動(dòng)插件的方法,具有一定借鑒價(jià)值,需要的朋友可以參考下。希望大家閱讀完這篇文章后大有收獲。下面讓小編帶著大家一起了解一下。
用es6語(yǔ)法方式寫了個(gè)微信小程序小插件–數(shù)字滾動(dòng);
效果圖:
wxml頁(yè)面布局代碼:
<!--pages/main/index.wxml--><view class="animate-number"> <view class="num num1">{{num1}}{{num1Complete}}</view> <view class="num num2">{{num2}}{{num2Complete}}</view> <view class="num num3">{{num3}}{{num3Complete}}</view> <view class="btn-box"> <button bindtap="animate" type="primary" class="button">click me</button> </view></view>
index.js調(diào)用NumberAnimate.js
// pages/main/index.jsimport NumberAnimate from "../../utils/NumberAnimate";Page({ data:{ }, onLoad:function(options){ // 頁(yè)面初始化 options為頁(yè)面跳轉(zhuǎn)所帶來(lái)的參數(shù) }, onReady:function(){ }, onShow:function(){ // 頁(yè)面顯示 }, onHide:function(){ // 頁(yè)面隱藏 }, onUnload:function(){ // 頁(yè)面關(guān)閉 }, //調(diào)用NumberAnimate.js中NumberAnimate實(shí)例化對(duì)象,測(cè)試3種效果 animate:function(){ this.setData({ num1:'', num2:'', num3:'', num1Complete:'', num2Complete:'', num3Complete:'' }); let num1 = 18362.856; let n1 = new NumberAnimate({ from:num1,//開(kāi)始時(shí)的數(shù)字 speed:2000,// 總時(shí)間 refreshTime:100,// 刷新一次的時(shí)間 decimals:3,//小數(shù)點(diǎn)后的位數(shù) onUpdate:()=>{//更新回調(diào)函數(shù) this.setData({ num1:n1.tempValue }); }, onComplete:()=>{//完成回調(diào)函數(shù) 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代碼:
/** * Created by wangyy on 2016/12/26. */'use strict';class NumberAnimate { constructor(opt) { let def = { from:50,//開(kāi)始時(shí)的數(shù)字 speed:2000,// 總時(shí)間 refreshTime:100,// 刷新一次的時(shí)間 decimals:2,// 小數(shù)點(diǎn)后的位數(shù) onUpdate:function(){}, // 更新時(shí)回調(diào)函數(shù) onComplete:function(){} // 完成時(shí)回調(diào)函數(shù) } this.tempValue = 0;//累加變量值 this.opt = Object.assign(def,opt);//assign傳入配置參數(shù) this.loopCount = 0;//循環(huán)次數(shù)計(jì)數(shù) this.loops = Math.ceil(this.opt.speed/this.opt.refreshTime);//數(shù)字累加次數(shù) this.increment = (this.opt.from/this.loops);//每次累加的值 this.interval = null;//計(jì)時(shí)器對(duì)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(); } //解決0.1+0.2不等于0.3的小數(shù)累加精度問(wèn)題 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;
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