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JS文本获得焦点清除文本文字的示例代码

　　本文标签：JS,获得焦点

如下所示：

复制代码 代码如下:

<!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=utf-8" />
<title>无标题文档</title>
<style type="text/css">
.clearFieldBlurred{
    color:#ccc;
    font-style:italic;
    font-weight:normal;
    width:150px;
}

.clearFieldActive{
    color:#4e4e4e;
    font-weight:bold;
    width:150px;
}
</style>
<script type="text/javascript">
function clearFiled(){
    var bbb=document.getElementById("bbb");
    if(bbb.value=="bbb"){
        bbb.value=;
        bbb.className=clearFieldActive;
    }
}

window.document.onmousedown=function(){
    var bbb=document.getElementById(bbb);
    if(bbb.value==""){
    bbb.value=bbb;
    bbb.className=clearFieldBlurred;
    }
}
</script>
</head>

<body>
<input type="text" id="aaa"  value="aaa" class="clearFieldBlurred" onfocus="if(this.value==aaa){this.value=;this.className=clearFieldActive;}"  onblur="if(this.value==){this.value=aaa;this.className=clearFieldBlurred;}"/>
<br />
<input type="text" id="bbb" value="bbb" class="clearFieldBlurred" onclick="clearFiled()"  />
</body>
</html>