input框内默认文字点击消失

时间：2022-01-14 07:50:02
<!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>

<script type="text/javascript">

function addLoadEvent(func){

 var oldonload = window.onload;

 if(typeof window.onload!= 'function' ){

   window.onload = func;

 }

 else{

  window.onload = function(){

  oldonload();

  func();

  }

 }

}

var inputtext = function(){

 var inputs = document.getElementsByTagName('INPUT');

 for(var i=0; i<inputs.length; i++){

  var str = "gray_input";

  if(str.indexOf(inputs[i].className)==-1) continue;

  var element = inputs[i];

  element.onfocus = function() {

     if (this.value == this.defaultValue) {

        this.value = "";

     this.className = "gray_input2";

    }

     }

       element.onblur = function() {

       if (this.value == "") {

          this.value = this.defaultValue;

     this.className = "gray_input";

          }

        }

 }

}

addLoadEvent(inputtext);

</script>

<style>

.gray_input{color:#878787;}

.gray_input2{color:#444;}

</style>

</head>

<body>

<input name="text2" type="text" id="main_search3" class="gray_input" value="搜一下问题来回答"/>

</body>

</html>

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