前端图片下载

http://www.javashuo.com/article/p-ohvauvhu-ka.html

http://www.javashuo.com/article/p-yunccuvr-dz.html

//会从新打开一个浏览器窗口，后续在作研究，用canvas.todataURL又不能下载跨域图片

$(function () {
    function download(src) {
        var $a = document.createElement('a');
        $a.setAttribute("href", src);
        $a.setAttribute("download", "");
        var evObj = document.createEvent('MouseEvents');
        evObj.initMouseEvent( 'click', true, true, window, 0, 0, 0, 0, 0, false, false, true, false, 0, null);
        $a.dispatchEvent(evObj);
        console.log("下载成功")
    };
    download("https://www.baidu.com/img/bd_logo1.png")
})