JavaScript如何实现base64图片压缩

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base64 图片压缩

//压缩base64方法function dealImage(base64, w, callback) { var newImage = new Image(); var quality = 0.6; //压缩系数0-1之间 newImage.src = base64; newImage.setAttribute("crossOrigin", 'Anonymous'); //url为外域时需要 var imgWidth, imgHeight; newImage.onload = function() { imgWidth = this.width; imgHeight = this.height; var canvas = document.createElement("canvas"); var ctx = canvas.getContext("2d"); if (Math.max(imgWidth, imgHeight) > w) {  if (imgWidth > imgHeight) {  canvas.width = w;  canvas.height = w * imgHeight / imgWidth;  } else {  canvas.height = w;  canvas.width = w * imgWidth / imgHeight;  } } else {  canvas.width = imgWidth;  canvas.height = imgHeight;  quality = 0.6; } ctx.clearRect(0, 0, canvas.width, canvas.height); ctx.drawImage(this, 0, 0, canvas.width, canvas.height); var base64 = canvas.toDataURL("image/jpeg", quality); //压缩语句 callback(base64); //必须通过回调函数返回，否则无法及时拿到该值 }}

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