问从img标签获取源镜像文件

EN

var linkElement = document.createElement('a');
try{
    url = "www.example.com/pic1.jpeg";
    linkElement.setAttribute('href', url);
    linkElement.setAttribute("download", ');
    var clickEvent = new MouseEvent("click", {
        "view": window,
        "bubbles": true,
        "cancelable": false
    });
    linkElement.dispatchEvent(clickEvent);          
}
catch (ex){  
    console.log(ex)
}