代码如下：
<!DOCTYPE html><html> <head> <meta charset="UTF-8"> <title></title> <style> ?*{ ?margin: 0; ?padding: 0; ?} ?body{ ?overflow-y: auto; ?} ?ul{ ?margin-top: 20px; ?border-top: 1px solid #666; ?} ?h1{ ?width: 500px; ?margin: 0 auto; ?color: deeppink; ?height: 100px; ?line-height: 100px; ?} ?li{ ?list-style: none; ?padding: 15px 0px 15px 60px; ?border-bottom:1px solid #ccc; ?font-size: 0px; ?line-height: 30px; ?/*height: 60px;*/ ?} ?input[type=button],li strong,li em,li span,li div{ ?height: 30px; ?font-size: 20px; ?line-height: 30px; ?text-align: center; ?} ?input[type=button],li strong ?{ ?width: 60px; ?} ?li span,li em{ ?width: 80px; ?background: pink; ?} ?li div{ ?width: 100px; ?} ?li strong,li span,li em,li div{ ?display: inline-block; ?} </style> <script> ?window.onload=function(){ ?var oUl=document.getElementById(‘list‘); ?var aLi=oUl.getElementsByTagName(‘li‘); ?for(var i=0;i<aLi.length;i++){ ??fn1(aLi[i]); ?} ?function fn1(aLi){ ??var aBtn=aLi.getElementsByTagName(‘input‘); ??var aStrong=aLi.getElementsByTagName(‘strong‘)[0]; ??var aEm=aLi.getElementsByTagName(‘em‘)[0]; ??var aSpan=aLi.getElementsByTagName(‘span‘)[0]; ??var num=Number(aStrong.innerHTML); //aStrong.innerHTML=‘0‘ ??var price=parseFloat(aEm.innerHTML);//aEm.innerHTML=‘12.9元‘ ??aBtn[0].onclick=function(){ ??if(num>0) ??{ ??num--; ??aStrong.innerHTML=num; ??aSpan.innerHTML=(num*price).toFixed(1)+‘元‘ ??} ??} ??aBtn[1].onclick=function(){ ??num++; ??aStrong.innerHTML=num; ??aSpan.innerHTML=(num*price).toFixed(1)+‘元‘ ??} ?} ?} </script> </head> <body> <h1>点点看，仿购物车+ -效果</h1> <ul id="list"> ?<li> ?<input type="button" value="-" /> ?<strong>0</strong> ?<input type="button" value="+" /> ?<div class="s1">单价:</div><em>12.9元</em> ?<div class="s1">共计：</div><span>0</span> ?</li> ?<li> ?<input type="button" value="-" /> ?<strong>0</strong> ?<input type="button" value="+" /> ?<div class="s1">单价:</div><em>45.7元</em> ?<div class="s1">共计：</div><span>0</span> ?</li> ?<li> ?<input type="button" value="-" /> ?<strong>0</strong> ?<input type="button" value="+" /> ?<div class="s1">单价:</div><em>67.5元</em> ?<div class="s1">共计：</div><span>0</span> ?</li> ??<li> ?<input type="button" value="-" /> ?<strong>0</strong> ?<input type="button" value="+" /> ?<div class="s1">单价:</div><em>14.7元</em> ?<div class="s1">共计：</div><span>0</span> ?</li> ?<li> ?<input type="button" value="-" /> ?<strong>0</strong> ?<input type="button" value="+" /> ?<div class="s1">单价:</div><em>45.6元</em> ?<div class="s1">共计：</div><span>0</span> ?</li> ?<li> ?<input type="button" value="-" /> ?<strong>0</strong> ?<input type="button" value="+" /> ?<div class="s1">单价:</div><em>32.4元</em> ?<div class="s1">共计：</div><span>0</span> ?</li> </ul> </body></html>js实现仿购物车加减效果
原文地址：https://www.cnblogs.com/liuyanxia/p/8582806.html