脚本宝典收集整理的这篇文章主要介绍了js实例教程-JavaScript实现购物车商品计算，脚本宝典觉得挺不错的，现在分享给大家，也给大家做个参考。

 <p>       <p>单价:<span>30</span></p>       <input tyPE="button" value="-" class="sub">       <input type="text" value="1">       <input type="button" value="+" class="add">       <p>总价:<span>30</span></p>   </p>   <p>       <p>单价:<span>666</span></p>       <input type="button" value="-" class="sub">       <input type="text" value="1">       <input type="button" value="+" class="add">       <p>总价:<span>666</span></p>   </p>   <p>       <p>单价:<span>888</span></p>       <input type="button" value="-" class="sub">       <input type="text" value="1">       <input type="button" value="+" class="add">       <p>总价:<span>888</span></p>   </p>  

 VAR aAdd = document.querySelectorAll(".add");       var sub = document.querySelectorAll(".sub");       for (var i = 0; i < aAdd.length; i++) {           aAdd[i].onclick = function () {               var num = Number(this.previousElementSibling.value);               num++;               this.PReviousElementSibling.value = num;               var price = this.previousElementSibling.previousElementSibling.previousElementSibling.FirstElementChild.innerHTML;               this.nextElementSibling.firstElementChild.innerHTML = price * num;           }       }       for (var i = 0; i < sub.length; i++) {           sub[i].onclick = function () {               var num = Number(this.nextElementSibling.value);               num--;               this.nextElementSibling.value = num;               var price = this.previousElementSibling.firstElementChild.innerHTML;               this.nextElementSibling.nextElementSibling.nextElementSibling.firstElementChild.innerHTML = price * num;           }       }  

html代码

 <p>       <p>单价:<span>30</span></p>       <input type="button" value="-" class="sub">       <input type="text" value="1">       <input type="button" value="+" class="add">       <p>总价:<span>30</span></p>   </p>   <p>       <p>单价:<span>666</span></p>       <input type="button" value="-" class="sub">       <input type="text" value="1">       <input type="button" value="+" class="add">       <p>总价:<span>666</span></p>   </p>   <p>       <p>单价:<span>888</span></p>       <input type="button" value="-" class="sub">       <input type="text" value="1">       <input type="button" value="+" class="add">       <p>总价:<span>888</span></p>   </p>  

JS代码 

 var aAdd = document.querySelectorAll(".add");       var sub = document.querySelectorAll(".sub");       for (var i = 0; i < aAdd.length; i++) {           aAdd[i].onclick = function () {               var num = Number(this.previousElementSibling.value);               num++;               this.previousElementSibling.value = num;               var price = this.previousElementSibling.previousElementSibling.previousElementSibling.firstElementChild.innerHTML;               this.nextElementSibling.firstElementChild.innerHTML = price * num;           }       }       for (var i = 0; i < sub.length; i++) {           sub[i].onclick = function () {               var num = Number(this.nextElementSibling.value);               num--;               this.nextElementSibling.value = num;               var price = this.previousElementSibling.firstElementChild.innerHTML;               this.nextElementSibling.nextElementSibling.nextElementSibling.firstElementChild.innerHTML = price * num;           }       }  

觉得可用，就经常来吧！Javascript技巧 脚本宝典 欢迎评论哦！ js技巧，巧夺天工，精雕玉琢。小宝典献丑了！

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