详解canvas绘制多张图的排列顺序问题

<div id="myContent"></div>let imgArray = ['img1.png', 'img2.png'];let receiveArray = new Array();let $myContent = document.getELmentById("myContent");let {imgW, imgH} = {300, 300};let Canvas = document.createElement('canvas');let ctx = Canvas.getContext("2d");let scaleBy = 2;Canvas.width = imgW * scaleBy;Canvas.height= imgH * scaleBy;imgArray.forEach((e, idx) => {    let img = new Image();    img.src = e;    e.addEventListener('load', () => {        ctx.drawImage(img, 0, 0, imgW * scaleBy, imgH * scaleBy);                let imgCont = new Image();        imgCont.src = Canvas.toDataURL();        imgCont.id = 'img' + idx;         receiveArray.push(imgCont); // 将绘制的img节点收集到数组里，这里的顺序可能和imgArray的顺序不一样        if (receiveArray.length === imgArray.length) { //所有图片load并绘制完成            let sortArr = new Array();            receiveArray.forEach(ex => { //将所有绘制图片按imgArray顺序排序                sortArr[ex.id.split('img')[1]] = ex;            })            sortArr.forEach(ex2 => {                $myContent.appendChild(ex2)            })        }    })})