 
                        <html>
    <script src="http://lib.sinaapp.com/js/jquery/1.9.1/jquery-1.9.1.min.js"></script>
    <body>
        <p id="ppp" style="background-color:yellow">asasasa</p>
    </body>
    <script>
        function downloadUploadFile(fileid) {
            console.log(fileid);      // <p id="123">...</p> 此处为何传进来是dom对象??
            console.log(typeof fileid);// object??
        }
        function createNode(fileId, fileName) {
            return $("<p id='id_" + fileId + "'>  <a href='javascript:void(0)' onclick=downloadUploadFile(id_" + fileId + ");>下个载  " + fileName + "</p>");
        }
        var node = createNode('123', '槽边往事');
        console.log(node);        //[p#id_123]
        $("#ppp").append(node);
    </script>
</html>如上代码,用js创建提供下载功能的节点,并绑定download事件,可是为何穿进去的参数是对象?而不是id_123
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f12看下你的代码应该是onclick=downloadUploadFile(id_333),你是把变量id_333传进去了,应该加个引号
如楼上所说,要加个引号