<title>JavaScript为input/textarea自定义hover,focus效果</title>

<script type="text/javascript">

function suckerfish(type, tag, parentId) {

if (window.attachEvent) {

window.attachEvent("onload", function() {

var sfEls = (parentId==null)?document.getElementsByTagName(tag):document.getElementById(parentId).getElementsByTagName(tag);

type(sfEls);

});

}

}

sfHover = function(sfEls) {

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

sfEls[i].onmouseover=function() {

this.className+=" iptHover";

}

sfEls[i].onmouseout=function() {

this.className=this.className.replace(new RegExp(" iptHover\\b"), "");

}

}

}

sfFocus = function(sfEls) {

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

sfEls[i].onfocus=function() {

this.className+=" iptFocus";

}

sfEls[i].onblur=function() {

this.className=this.className.replace(new RegExp(" iptFocus\\b"), "");

}

}

}

</script>

<style type="text/css">

textarea{

border:1px solid #BBE1F1;

width:250px;

height:80px;

}

 .iptHover,input:hover,textarea:hover{

border:1px solid #77C2E3;

}

.iptFocus,input:focus,textarea:focus{

border:1px solid #77C2E3;

background-color:#EFF7FF;

}

</style>

<input type="text" name="textfield" /><br />

<textarea name="textarea"></textarea>

<script type="text/javascript">

suckerfish(sfHover, "input");

suckerfish(sfFocus, "input");

suckerfish(sfHover, "textarea");

suckerfish(sfFocus, "textarea");

</script>