阻止<a>標籤默認行爲
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>阻止事件的默認行爲</title>
<script type="text/javascript">
window.onload = function() {
var a = document.getElementById('mya');
a.onclick = function() {
alert(this.innerHTML);
/*經過return false; 實現阻止了點擊a標籤後,頁面的跳轉*/
return false;
}
}
</script>
</head>
<body>
<a href="http://www.baidu.com" id="mya">百度一下</a>
</body>
</html>
- 方式二 (經過javascript:; 或者 javascript:void(0);)
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>阻止事件的默認行爲</title>
<script type="text/javascript">
window.onload = function() {
var a = document.getElementById('mya');
a.onclick = function() {
alert(this.innerHTML);
}
}
</script>
</head>
<body>
<a href="javascript:void(0);" id="mya">百度一下</a> <!--經過javascript:void(0)-->
</body>
</html>
表單提交
<form action="/index">
<input type="text" />
<input type="submit" value="提交"/>
</form>
阻止表單提交
有2種方式:
第一種:<form>提交事件
第二種:提交按鈕
// 不推薦,寫法不優雅
<form onsubmit="go(event)"></form>
<script>
function go(e){
e.preventDefault();
}
</script>
// 不推薦,由於沒法對錶單數據進行驗證
<form action="/register" method="post" onsubmit="return false;"></form>
// 推薦寫法
<form action="/register" method="post">
<input type="text" name="username" placeholder="請輸入註冊用戶名"><br />
<input type="password" name="pwd" placeholder="請輸入初始密碼"><br />
<input type="password" name="aginpwd" placeholder="請再次輸入密碼"><br />
<input type="submit" value="註冊" class="login_btn">
</form>
<script>
var form = document.forms[0],
submit = document.querySelector(".login_btn"),
inputBtn = document.getElementsByTagName("input");
form.onsubmit = function(e) {
e.preventDefault();
// return false; 也能夠阻止表單提交
}
</script>
- 提交按鈕
<input type="submit"/>
// 不推薦,由於沒法對錶單數據進行驗證
<form action="/register" method="post">
<input type="text" name="username" placeholder="請輸入註冊用戶名"><br />
<input type="password" name="pwd" placeholder="請輸入初始密碼"><br />
<input type="password" name="aginpwd" placeholder="請再次輸入密碼"><br />
<input type="submit" value="註冊" class="login_btn" onclick="return false">
</form>
// 不推薦,寫法不優雅
<form action="/register" method="post">
<input type="text" name="username" placeholder="請輸入註冊用戶名"><br />
<input type="password" name="pwd" placeholder="請輸入初始密碼"><br />
<input type="password" name="aginpwd" placeholder="請再次輸入密碼"><br />
<input type="submit" value="註冊" class="login_btn" onclick="nogo(event);">
</form>
<script>
function nogo(e){
e.preventDefault();
}
</script>
// 推薦寫法
<form action="/register" method="post">
<input type="text" name="username" placeholder="請輸入註冊用戶名"><br />
<input type="password" name="pwd" placeholder="請輸入初始密碼"><br />
<input type="password" name="aginpwd" placeholder="請再次輸入密碼"><br />
<input type="submit" value="註冊" class="login_btn">
</form>
<script>
var form = document.forms[0],
submit = document.querySelector(".login_btn"),
inputBtn = document.getElementsByTagName("input");
submit.onclick = function(e){
e.preventDefault();
// return false; 也能夠阻止表單提交
}
</script>
// 不推薦,由於沒法對錶單數據進行驗證
<form action="/register" method="post">
<input type="text" name="username" placeholder="請輸入註冊用戶名"><br />
<input type="password" name="pwd" placeholder="請輸入初始密碼"><br />
<input type="password" name="aginpwd" placeholder="請再次輸入密碼"><br />
<button onclick="return false">註冊</button>
</form>
// 不推薦,寫法不優雅
<form action="/register" method="post">
<input type="text" name="username" placeholder="請輸入註冊用戶名"><br />
<input type="password" name="pwd" placeholder="請輸入初始密碼"><br />
<input type="password" name="aginpwd" placeholder="請再次輸入密碼"><br />
<button onclick="nogo(event);">註冊</button>
</form>
<script>
function nogo(e){
e.preventDefault();
}
</script>
// 推薦寫法
<form action="/register" method="post">
<input type="text" name="username" placeholder="請輸入註冊用戶名"><br />
<input type="password" name="pwd" placeholder="請輸入初始密碼"><br />
<input type="password" name="aginpwd" placeholder="請再次輸入密碼"><br />
<button class="login_btn" onclick="nogo(event);">註冊</button>
</form>
<script>
var form = document.forms[0],
submit = document.querySelector(".login_btn"),
inputBtn = document.getElementsByTagName("input");
submit.onclick = function(e){
e.preventDefault();
// return false; 也能夠阻止表單提交
}
</script>