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";//跨域必須使用，且后臺也得設(shè)置允許跨域  dataURL='';  Img.src=url;  Img.onload=function(){ //要先確保圖片完整獲取到，這是個異步事件   var canvas = document.createElement("canvas"), //創(chuàng)建canvas元素   width=Img.width, //確保canvas的尺寸和圖片一樣   height=Img.height;   canvas.width=width;   canvas.height=height;   canvas.getContext("2d").drawImage(Img,0,0,width,height); //將圖片繪制到canvas中   dataURL=canvas.toDataURL('image/jpg'); //轉(zhuǎn)換圖片為dataURL   condataurl?condataurl(dataURL,charImg):null; //調(diào)用回調(diào)函數(shù)  };} function condataurl(dataURL,charImg){ charImg.src=dataURL; //console.log(charImg);}