JS验证并提交表单

 很简单的一个例子

function checkForm(){
            var reg = new RegExp("^[A-Za-z0-9]+$");
          if(!reg.test(form1.name.value)){
                alert("用户名只能由字母和数字组成");
                form1.name.value = "";
                form1.pwd.value = "";
                form1.name.focus();
                return false;
              }
             return true;
         }
      function regist(){
           if(checkForm()){
                  with(document.getElementById("form1")){
                      method = "post";
                      action = "user/regist";
                      submit();
                      }
                }
          }