首頁 > 開發者 > JavaScript
一、需求原因
在填寫表單時需要實現如下效果
二、具體實現
複製代碼 代碼如下:
<!DOCTYPE html PUBLIC "-//W3C//DTDHTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type"content="text/html; charset=UTF-8">
<title>滑鼠點擊後無文字，挪開滑鼠後有文字</title>
<script language="JavaScript"src="../jQuery/jquery-1.7.1.min.js"></script>
<script type="text/javascript">
$(function(){
/*進入焦點時觸發*/
$("#account").focus(function(){
varoldValue = $(this).val();
if(oldValue == this.defaultValue){
$(this).val("");
}
});
/*失去焦點時觸發*/
$("#account").blur(function(){
alert("12");
varoldValue = $(this).val();
if(oldValue == ""){
$(this).val(this.defaultValue);
}
});
});
</script>
</head>
<body>
帳號：<input id="account"name="account" type="text" value="請輸入帳號">
</body>
</html>
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