其实就是创建一个a标签,设置a标签 download属性,只是用js的方式使用
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);