                        課程
                    
                        /前端開發(fā)
                        
                            /JavaScript
                        
                        /表單驗證

最后單表提交時的驗證還得添加這么一個函數(shù)

在<form>里添加一個onsubmit的屬性，JS添加一個用于表單驗證的函數(shù)。函數(shù)錯誤，則return false，表單則不能被上傳

<html>
???<head>
??????<script>
?????????function?validate(){
?????????
????????????var?t1?=?document.getElementById("t1");
????????????var?t2?=?document.getElementById("t2");
????????????
????????????if(t1.value?==""?||?t1.value.length<=6){
???????????????alert("t1?error");
???????????????return?false;
????????????}
????????????if(t1.value?==""?||?t2.value.length<=10){
???????????????alert("t2?error");
???????????????return?false;
????????????}
????????????alert("form?submit?success");
????????????return?true;
?????????}
??????</script>
???</head>
???<body>
??????<form?id="form1"?name="form2"?action=""?onsubmit="return?validate()"?method="post">
?????????t1?length?must?be?larger?than?6<input?type="text"?id="t1"?name="t1">
?????????t2?length?must?be?larger?than?10<input?type="text"?id="t2"?name="t2">
?????????<input?type="submit"?value="submit">
??????</form>
???
???</body>

</html>