JavaScript? ??? ?? ??? ???? ?? ???? ??? ?????.
??? ? ????? ??? ?? ??? ??????. ?? ??? ?? ?? ??? ?????.
??? ??? ??? ??? ??? ??? ??? ? ????. ?? ???
???? ?? ???? ???? ?? ?? ??? ??? ???? ?????. ??? ???????.
<script>
function a3(td,td2,id){
var price = document.getElementById(td).innerHTML;//獲得單價(jià)
var total = document.getElementById(td2).innerHTML;//獲得總價(jià)
var v1 = parseInt(document.getElementById(id).value);//獲得數(shù)量
if(isNaN(v1) || v1 < 1){
alert("請(qǐng)輸入正確的數(shù)字");
document.getElementById(id).value = 1 ;
v1 = parseInt(document.getElementById(id).value);
}else{
document.getElementById(id).value = v1 ;
}
document.getElementById(td2).innerHTML = parseInt(price) * parseInt(v1);
}
</script>v1? ??? ?? ??? ??? ??? v1 ??? ?????. , isNaN() ??? v1? ??? ????, v1<1? ???? ?????. ? ?? ???? ??? ?? ? ?? ??? ?????
??? ??? ?? ??? ?????. ??? ?? ?? ??:
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title></title>
<style type="text/css">
table{width:350px;border:1px solid #eee;text-align:center;}
.tr2{height:50px;}
input{width:30px;height:20px;text-align: center;}
a{text-decoration:none}
</style>
<script type="text/javascript">
function a1(td,td2,id){
var price = document.getElementById(td).innerHTML;//獲得單價(jià)
var total = document.getElementById(td2).innerHTML;//獲得總價(jià)
var v1 = parseInt(document.getElementById(id).value);//獲得數(shù)量
document.getElementById(id).value = v1+1;
document.getElementById(td2).innerHTML = parseInt(price) * parseInt(v1+1);
}
function a2(td,td2,id){
var price = document.getElementById(td).innerHTML;//獲得單價(jià)
var total = document.getElementById(td2).innerHTML;//獲得總價(jià)
var v1 = parseInt(document.getElementById(id).value);//獲得數(shù)量
if(v1>1){
document.getElementById(id).value = v1-1;
document.getElementById(td2).innerHTML = parseInt(price) * parseInt(v1-1);
}else{
var v1 = 1;
}
}
function a3(td,td2,id){
var price = document.getElementById(td).innerHTML;//獲得單價(jià)
var total = document.getElementById(td2).innerHTML;//獲得總價(jià)
var v1 = parseInt(document.getElementById(id).value);//獲得數(shù)量
if(isNaN(v1) || v1 < 1){
alert("請(qǐng)輸入正確的數(shù)字");
document.getElementById(id).value = 1 ;
v1 = parseInt(document.getElementById(id).value);
}else{
document.getElementById(id).value = v1 ;
}
document.getElementById(td2).innerHTML = parseInt(price) * parseInt(v1);
}
</script>
</head>
<body>
<table cellspacing="0" cellpadding="0" border="1">
<tr>
<th>名稱</th>
<th>單價(jià)</th>
<th>數(shù)量</th>
<th>總價(jià)</th>
</tr>
<tr class="tr2">
<td>手表</td>
<td id="price">1999</td>
<td>
<a href="#" id="a1" class="tp1" onclick="a2('price','total','count')">-</a>
<input type="text" value="1" id="count" onblur="a3('price','total','count')">
<a href="#" id="a2" class="tp2" onclick="a1('price','total','count')">+</a>
</td>
<td id="total">1999</td>
</tr>
<tr class="tr2">
<td>手機(jī)</td>
<td id="price_1">1999</td>
<td>
<a href="#" id="a1" class="tp1" onclick="a2('price_1','total_1','count_1')">-</a>
<input type="text" value="1" id="count_1" onblur="a3('price_1','total_1','count_1')">
<a href="#" id="a2" class="tp2" onclick="a1('price_1','total_1','count_1')">+</a>
</td>
<td id="total_1">1999</td>
</tr>
</table>
</br>
</body>
</html>
