前端根据图片url下载图片到本地的一种方法

废话不多说直接上代码

var canvas = document.createElement('canvas');  

var img = new Image(); 

img.crossOrigin = 'anonymous';

 img.onerror = function () { 

    eturn reject(new Error('找不到 ' + href)); 

}; 

img.onload = function () { 

    canvas.width = img.width; 

    canvas.height = img.height; 

    canvas.getContext('2d').drawImage(img, 0, 0); 

    svgToPng(canvas.toDataURL('image/png')) 

}; 

img.src = href;