<div id="mometer">
<div id="hot"></div>
<span>
<div id="Hgheader">0℃</div>
<div id="Hg"></div>
</span>
</div>
<input name="aa" type="text" value="請(qǐng)輸入0-100的數(shù)值" id="num"/>
<input name="" type="button" id="Risk" value="查看度數(shù)" />

#num{color:#999;}
#mometer{position:relative; height:100px;width:15px;background-color:#CCC;margin:50px;}
span{position:absolute;display:block;bottom:0px;width:40px;}
#Hgheader{height:15px;line-height:15px;color:#FF0000;font-size:14px;font-family:Arial, Helvetica, sans-serif;
border-bottom:#f00 1px solid;left:-40px;position:relative;}
#Hg{height:0px; font-size:0px;background-color:#C00;width:15px;}
#hot{height:100px;width:15px; background-color:#FF0; position:absolute; top:0; left:0;}

$(document).ready(function(){
$("#hot").fadeTo(0,0);//初始透明度為0；
$('#num').click(function(){this.select();})
$('#Risk').click(function(){
inputvalue=$('#num').val();//val()獲取input元素的值，另外還可以用attr("value")來(lái)獲取；
var inputnum=parseInt(inputvalue);
if($('#num').val().search("^-?//d+$") != 0){
alert("請(qǐng)輸入一個(gè)0-100的整數(shù)!");
return false;
}else{
$("#Hgheader").html(inputvalue+"℃");
if(inputnum>=100){
inputnum=100;
$('#num').val(100)
$("#Hgheader").html(100+"℃");
}else if(inputnum<=0){
inputnum=0;
$('#num').val(0)
$("#Hgheader").html(0+"℃");
}
}
var Columnhe=inputnum/100;
$("#Hg").animate({height:inputnum},'show');
$("#hot").fadeTo('slow',Columnhe);
//在這里把html換成text效果也是一樣的;
});
});