html2canvas实现保存网页为图片，canvas2image解决图片模糊问题

1. 下载canvas2image.js和html2canvas.js文件，百度官方即可下载
2. 具体代码如下

            

            


$(function() {
            var canvas2 = document.createElement("canvas");
            let _canvas = document.querySelector('.card-bg');//需要替换成图片的html区域
            //获取宽高
            var w = parseInt(window.getComputedStyle(_canvas).width);
            var h = parseInt(window.getComputedStyle(_canvas).height);
            //将canvas画布放大若干倍，然后盛放在较小的容器内，就显得不模糊了
            canvas2.width = w * 2;
            canvas2.height = h * 2;
            canvas2.style.width = w + "px";
            canvas2.style.height = h + "px";
            //可以按照自己的需求，对context的参数修改,translate指的是偏移量
            //  var context = canvas.getContext("2d");
            //  context.translate(0,0);
            var context = canvas2.getContext("2d");
            context.scale(1.85, 1.7);
            html2canvas(_canvas,{canvas:canvas2}).then(function(canvas) {
                var imgUri = canvas.toDataURL("image/png").replace("image/png", "image/octet-stream"); // 获取生成的图片的url
                $(".card-bg").html('');
            })
        });