canvas压缩图片

// 对图片进行压缩 function compress(imgPath) { var image = new Image(); //新建一个img标签（还没嵌入DOM节点) image.src = imgPath; image.onload = function() { var canvas = document.createElement(‘canvas’); var context = canvas.getContext(‘2d’); var imageWidth = image.width / 3; //压缩后图片的大小 var imageHeight = image.height / 3; var data = ‘’; canvas.width = imageWidth; canvas.height = imageHeight; context.drawImage(image, 0, 0, imageWidth, imageHeight); data = canvas.toDataURL(‘image/jpeg’) //压缩完成 $(".srcDiscernImg").attr(“src”, data); console.log(“渲染。。。。”); } }