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HTML DOM focus()和blur()方法 输入框鼠标指过自动消失鼠标离开显示 js

 
阅读更多

http://blog.csdn.net/zyxlinux888/article/details/7391240

 

 

 

 

定义和用法

focus() 方法用于在密码域上设置焦点。

语法

passwordObject.focus()

实例

下面的例子可设置或移开密码域上的焦点:

<html>
<head>
<script type="text/javascript">
function setFocus()
  {
  document.getElementById('password1').focus()

  }
function loseFocus()
  {
  document.getElementById('password1').blur()

  }
</script>
</head>
<body>

<form>
<input type="password" id="password1" value="thgrt456" />
<input type="button" onclick="setFocus()" value="Set focus" />
<input type="button" onclick="loseFocus()" value="Lose focus" />
</form>

</body>
</html>
实例2:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>Untitled Document</title>

<script type="text/javascript">
       function chg(){
       document.getElementById("setfocus").value="";
       }
       function newChg(){
       document.getElementById("setfocus").value="请输入关键字";
       }
</script>

</head>

<body>
<input type="text" name="name" size="15" class="input" id="setfocus" value="请输入关键字" onfocus="chg()" onblur="newChg()">

</body>
</html>

实例3

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>Untitled Document</title>

<script type="text/javascript">
function $(ID) {return document.getElementById(ID);}
function chg(){
$("setfocus").value="";
}
function newChg(){
    if($("setfocus").value==""){
        $("setfocus").value="请输入关键字";
        }
    else{return $("setfocus").value }
}
</script>

</head>

<body>
<input type="text" name="name" size="15" class="input" id="setfocus" value="请输入关键字" onfocus="chg()" onblur="newChg()">

</body>
</html>
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