HTML页面点击下载文件的两种实现方法

<a href="/user/test/xxxx.txt" download="文件名.txt">点击下载</a>  

<!DOCTYPE html>  
<html>  
    <head>  
        <meta charset="UTF-8">  
        <title></title>  
    </head>  
    <body>  
        <a href="321.png" download="test.png">点击下载</a>    
    </body>  
</html>  

var $eleBtn1 = $("#btn1");  
        var $eleBtn2 = $("#btn2");  
        //已知一个下载文件的后端接口：https://codeload.github.com/douban/douban-client/legacy.zip/master  
        //方法一：window.open()  
        $eleBtn1.click(function(){  
            window.open("https://codeload.github.com/douban/douban-client/legacy.zip/master";);  
        });  

//方法二：通过form  
        $eleBtn2.click(function(){  
            var $eleForm = $("<form method='get'></form>");  
            $eleForm.attr("action","https://codeload.github.com/douban/douban-client/legacy.zip/master";);  
            $(document.body).append($eleForm);  
            //提交表单，实现下载  
            $eleForm.submit();  
        });