vue 封装原型方法 加 promist .then
作者:互联网
核心代码如下
/** * 2019年5月11日 10:54:32 * @xieyishang * 封装生成海报js */ /** * A 海报地址 * B 是头像二维码地址 * 第三个参 插入的id节点 * * 用了pormist 还可以用 .then */ const drawAndShareImage = (imgA,imgB,dom)=>{//封装生成海报方法~ return new Promise((resolve,reject)=>{ var canvas = document.createElement("canvas"); canvas.width = 1304; canvas.height = 2316; var context = canvas.getContext("2d"); context.rect(0 , 0 , canvas.width , canvas.height); context.fillStyle = "#fff"; context.fill(); var imageA = new Image(); imageA.crossOrigin = 'Anonymous'; imageA.src = imgA; imageA.onload = function(){ context.drawImage(imageA , 0 , 0 , 1306 , 2316); var imageB = new Image(); imageB.crossOrigin = 'Anonymous'; imageB.src = imgB; imageB.onload = function(){ context.drawImage(imageB , 10 , 2060 , 240 , 240); //var base64 = canvas.toDataURL("image/png"); var base64 = canvas.toDataURL("image/jpeg"); var img = document.getElementById(dom); // console.log('Hello'); img.setAttribute('src' , base64); console.log("加载完了~"); if (dom!=null) { resolve(true); }else { reject(false); } } } }); } export { drawAndShareImage }
main.js引入
import {drawAndShareImage } from '@/utils/canvascode';//生成海报方法 Vue.prototype.$Canvas = drawAndShareImage;//放在原型里面~
调用
this.$Canvas(this.shareBannerSRC,this.codeSRC,"shareBoximg").then(val=>{ console.log("val",val); this.shareBox = true; this.shareWait = false; Toast.clear(); });
标签:canvas,vue,封装,promist,imageB,imageA,context,var,drawAndShareImage 来源: https://www.cnblogs.com/shaozhu520/p/10848627.html