功能：在id=submit的元素中创建一个保存按钮

function  createSaveSubmit(){
        input = document.createElement("input");    $(input).attr("type", "submit");    $(input).attr("onclick", "submitSave()");    $(input).attr("id", "submitSave");    $(input).attr("name", "outcome");    $(input).attr("value",  "保存");    document.getElementById('submit').appendChild(input );}