??? ?? ?????? ?? JavaScript ?? ???? ????
?? ?? ??
?? ??? ?? ??? ??? ???? ????. class="shop2" div ??? ???? + ?? -? ???? ??? ?????. ?? ??? ??? ???? ?? ? ?? ??? ???? ?? ????? ?? ?????. ??? ??? ???? ???
?? ??? ??? ?????. ?? ??? ??? ?? ?????. parameters
//+?? ???
function add(text,price,subtotal){
//?? ??? ?? ????
var num =document.getElementById( text).value;
//??? 1? ??? ?? ??? ???? <inpue>? value ??? ?????
++num;
document.getElementById( text).value=num;
//?? ???? ??? ???, ??? ??? ??? ?? div? ??? ?? ??? ??
var Price= document.getElementById (??). - ??
function minus(text,price,subtotal){
var num=document.getElementById(text).value;
//??? ???? ??
if(--num<1){
document.getElementById(text).value=0;
}else{
document.getElementById(text).value=num
}
//?? ???? ??? ?????. ??? ??? ?? ?? ??? ?? div? ??? ?? ??? ?????.
//num? ?? ???? ?? ??? ?? ??? ???? ????. num=-1 ??
var num=document.getElementById(text).value;
var Price=document.getElementById(price).innerHTML;
document.getElementById(??).innerHTML= Price*num;
}
?? ? ??? ?????. ??? ??? ??? ?
functionchange(text,price,subtotal){
/ /??? ??? ??? ??? ?????. ???? ????? ??????
if( isNaN(document.getElementById(text).value)){
Alert("??? ?????");
document.getElementById(text).value=1;
}
//id="text"
? ?? ??? ?? ?????. var num=document.getElementById(text).value;
//?? ?? ????
var ??=document .getElementById(price).innerHTML;
//?? ??
document.getElementById(subtotal).innerHTML=price *num;
}
function delect(shop2){
//id="shop"? div ??
document.body.removeChild(document.getElementById(shop2));
}
?? ?? ???? ???? ? ??? ??? ?? ID? ?? ??? ?????. value
??? ??? ??? ????
<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1.0, minimum-scale=1.0, maximum-scale=1.0, user-scalable=no">
<meta name="format-detection" content="telephone=no" />
<title>簡易購物車</title>
<meta charset="utf-8" />
<style>
.shop{
width:400px;
background-color:#f0f0f0;
text-align:center;
}
.shop2{
text-align:center;
clear:both;
border:1px solid black;
height:21px;
}
.goods{
float:left;
width:100px;
}
.price{
float:left;
width:50px;
}
.number{
float:left;
width:110px;
}
.subtotal{
float:left;
width:50px;
margin-top:2px;
}
.delete{
float:left;
width:35px;
margin-left:5px;
}
.text{
width: 22px;
text-align:center;
}
</style>
<script >
//按下+按鈕
function add(text,price,subtotal){
//取出當(dāng)前頁面的數(shù)量
var num=document.getElementById(text).value;
//將數(shù)量加一然后再賦值給顯示數(shù)量的<inpue>中的value屬性
++num;
document.getElementById(text).value=num;
//取出當(dāng)前頁面的數(shù)量，與數(shù)量相乘，賦值給小計(jì)所屬的div的頁面顯示內(nèi)容
var price=document.getElementById(price).innerHTML;
var subtotal=price*num;
document.getElementById(subtotal).innerHTML=price*num;
}
//按下-按鈕
function minus(text,price,subtotal){
var num=document.getElementById(text).value;
//判斷數(shù)量是不是負(fù)數(shù)
if(--num<1){
document.getElementById(text).value=0;
}else{
document.getElementById(text).value=num
}
//取出當(dāng)前頁面的數(shù)量，與數(shù)量相乘，賦值給小計(jì)所屬的div的頁面顯示內(nèi)容
//給num重新賦值是放置出現(xiàn)num=-1情況
var num=document.getElementById(text).value;
var price=document.getElementById(price).innerHTML;
document.getElementById(subtotal).innerHTML=price*num;
}
//用戶在<input>框中改變數(shù)字時(shí)，光標(biāo)失焦后觸發(fā)change()函數(shù)
function change(text,price,subtotal){
//判斷用戶輸入的是否為非數(shù)字，是則提醒用戶
if(isNaN(document.getElementById(text).value)){
alert("請輸入數(shù)字");
document.getElementById(text).value=1;
}
//取得id="text"的input框的value值
var num=document.getElementById(text).value;
//取得商品價(jià)格
var price=document.getElementById(price).innerHTML;
//將小計(jì)輸出出去
document.getElementById(subtotal).innerHTML=price*num;
}
function delect(shop2){
//刪除id="shop"的這個(gè)div
document.body.removeChild(document.getElementById(shop2));
}
</script>
</head>
<body>
<!--購物車標(biāo)題-->
<div class="shop">
<div class="title">簡易購物車</div>
<div class="goods">商品</div>
<div class="price">單價(jià)</div>
<div class="number">數(shù)量</div>
<div class="subtotal">小計(jì)</div>
<div class="delete">操作</div>
</div>
<!--商品內(nèi)容-->
<div class="shop2" id="shop2">
<form>
<div class="goods">小米MIX </div>
<div class="price" id="price2">5000</div>
<div class="number">
<input type="button" value="-" onclick="minus('text2','price2','subtotal2')"/>
<input type="text" value="1" class="text" id="text2" onblur="change('text2','price2','subtotal2')"/>
<input type="button" value="+" onclick="add('text2','price2','subtotal2')"/>
</div>
<div class="subtotal" id="subtotal2">5000</div>
<div class="delete" onclick="delect('shop2')"><a href="#">刪除</a></div>
<form>
</div>
<div class="shop2" id="shop3">
<form>
<div class="goods">iphone 8 </div>
<div class="price" id="price3">6000</div>
<div class="number">
<input type="button" value="-" onclick="minus('text3','price3','subtotal3')"/>
<input type="text" value="1" class="text" id="text3" onblur="change('text3','price3','subtotal3')"/>
<input type="button" value="+" onclick="add('text3','price3','subtotal3')"/>
</div>
<div class="subtotal" id="subtotal3">5000</div>
<div class="delete" onclick="delect('shop3')"><a href="#">刪除</a></div>
<form>
</div>
</body>
</html>??: ?? ????? ?? ???? ??? ????. ?? ?? ?? ??? ??? ??? ??? ????? ?? ??? ???. ??? ??, ?? ?? ?? ??, ?? ?? ?? ?? ?? ?????. ?? ???? ???????
