js图片下载

var url = 'https://ss0.bdstatic.com/70cFvHSh_Q1YnxGkpoWK1HF6hhy/it/u=743446847,1016653021&fm=27&gp=0.jpg'

// 将链接地址字符内容转变成blob地址

fetch( url). then( res => res. blob()). then( blob => { 

// 创建隐藏的可下载链接   

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

a. style. display = 'none';

a. href = URL. createObjectURL( blob);       

a. download = 'QRcode.jpg';

document. body. appendChild( a);

a. click();

//移除元素

document. body. removeChild( a);

});