asp.net mvc js表单验证怎么写？求教高手！function OneTest() {
//        alert(document.getElementById("UserName").value);
        if (document.getElementById("UserName").value = "") {
            alert("文本框不能为空！");
            document.getEletementById("UserName").focus();
            return false;
        }
        if (document.getEletementById("UTitle").value="") {
            alert("文本框不能为空！");
            document.getEletementById("UTitle").focus();
            return false;
        }
        if (document.getEletementById("LeaveMessage").value="") {
            alert("文本框不能为空！");
            document.getEletementById("LeaveMessage").focus();
            return false;
        }
    }

我写了return怎么表单还是能提交，进如action啊求教！