js 实现post提交

function post(URL, PARAMS) {        
            var temp = document.createElement("form");        
            temp.action = URL;        
               temp.method = "post";        
            temp.style.display = "none";        
            for (var x in PARAMS) {        
                var opt = document.createElement("textarea");        
                opt.name = x;        
                    opt.value = PARAMS[x];        
                // alert(opt.name)        
                temp.appendChild(opt);        
            }        
            document.body.appendChild(temp);        
            temp.submit();        
            return temp;        
} 
post("/tolistUsers",{username:$("#sname").val()});