js生成word中图片处理方法

function changeImgToDataurl(){ var charImg = document.all("exportdom").getElementsByTagName("img");  var imgURLs = "";  for (var i = 0; i < charImg.length; i++) {    var imgURL = charImg[i].currentSrc;    getBase64(imgURL,charImg[i]); } }function getBase64(url,charImg){  var Img = new Image();  Img.crossOrigin = "Anonymous";//跨域必须使用，且后台也得设置允许跨域  dataURL='';  Img.src=url;  Img.onload=function(){ //要先确保图片完整获取到，这是个异步事件   var canvas = document.createElement("canvas"), //创建canvas元素   width=Img.width, //确保canvas的尺寸和图片一样   height=Img.height;   canvas.width=width;   canvas.height=height;   canvas.getContext("2d").drawImage(Img,0,0,width,height); //将图片绘制到canvas中   dataURL=canvas.toDataURL('image/jpg'); //转换图片为dataURL   condataurl?condataurl(dataURL,charImg):null; //调用回调函数  };} function condataurl(dataURL,charImg){ charImg.src=dataURL; //console.log(charImg);}