本文实例为大家分享了js实现购物车功能的具体代码,供大家参考,具体内容如下
使用html配合原生js实现购物车功能
* 实现购物车商品数量的加减,注意数量最少为1,数量输入仅能为数字
* 实现购物车商品的移除
* 可以在同一页面再设计几个商品信息,每个商品有价格,图片,名称,以及添加至购物车按钮,点击按钮后添加至购物车
* 实现购物车商品的总价计算
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<!doctype html> < html lang = "en" > < head > < meta charset = "UTF-8" > < title >商品</ title > < style > html,body{ margin: 0;} .row{ width:100%; height:300px; } .col{ width:200px; height:216px; margin: 0px 1px 0px 1px; padding-top: 2px; border:solid black 1px; float:left; text-align:center; } .col img { width: 150px;} </ style > < script src = "js/jquery-3.2.1.min.js" ></ script > < script > function calculate() { var tbody = document.getElementById("tb"); var prices = tbody.querySelectorAll("td:nth-child(4)"); var numbers = tbody.querySelectorAll("td:nth-child(5)>input[type=number]"); var checkboxes = tbody.querySelectorAll("th:nth-child(1)>input"); //console.log(prices); //console.log(numbers); //console.log(checkboxes); var total=0; for(var i = 0; i < prices.length ; i++) { console.log("价格:" +parseInt(prices[i].innerText)+" 数量:"+parseInt(numbers[i].value) + "是否勾选:" + checkboxes[i].checked); if(checkboxes[i].checked){ total += parseInt(prices[i].innerText)*parseInt(numbers[i].value); } } console.log("总价格:" + total); document.getElementById("total") .innerText = total ; } // 移除商品 function del(me) { var tr = me .parentNode.parentNode; var tbody = tr .parentNode; tbody.removeChild(tr); calculate(); } // 增加商品数量 function jia(me) { var td = me .parentNode; var inputs = td .getElementsByTagName("input"); // 找到此td下所有input标签 // inputs[1] .value = inputs [1].value - 0 + 1; // 用-0的办法转为数字 // parseInt 将字符串转整数 parseFloat 将字符串转小数 inputs[1] .value = parseInt (inputs[1].value) + 1; calculate(); } // 减少商品数量 function jian(me) { var td = me .parentNode; var num = td .querySelector("input[ type = number ]");// 只查找有 type = number 属性的input标签 var r = num .value - 1; if( r >= 1) { // 只有减得的结果是大于等于1的情况下才需要改变文本框的值 num.value = r; calculate(); } } // 改变复选框的选中状态 function check(me) { var tbody = document.getElementById("tb"); var inputs = tbody.querySelectorAll("th input"); for(var i = 0; i < inputs.length ; i++) { inputs[i] .checked = me .checked; // 根据me的checked状态去修改下面的每个checked状态 } calculate(); } // 添加商品至购物车 function add(me) { var tbody = document .getElementById("tb"); var div = me .parentNode; var spans = div .getElementsByTagName("span"); // 获得商品名字和价格的span var name = spans [0].innerText; // 获得商品名字 var col_1 = tbody .querySelectorAll("td:nth-child(2)"); // nth-child 作为第几个孩子 var found = null ; // found 变量代表购物车中找到的td for(var i = 0 ; i<col_1.length; i++) { if( col_1[i].innerText == name) { found = col_1 [i]; break; } } if(found != null) { //商品名字存在 // 修改数量 found 是找到的td var tr = found .parentNode; var input = tr .querySelector("td:nth-child(5)>input:last-child"); console.log(input); jia(input); } else { //商品名字不存在 // 添加商品 var tr = document.createElement("tr"); var th = document.createElement("th"); th.innerHTML = '< input type = "checkbox" checked onclick = "calculate()" >'; var td1 = document.createElement("td"); td1.innerText = spans[0].innerText; var td2 = document.createElement("td"); var img = document.createElement("img"); img.src = div.getElementsByTagName("img")[0].src; img.width = "100"; td2.appendChild(img); var td3 = document.createElement("td"); td3.innerText = spans[1].innerText; var td4 = document.createElement("td"); td4.innerHTML = '< input type = "button" value = "-" onclick = "jian(this)" >< input type = "number" value = "1" >< input type = "button" value = "+" onclick = "jia(this)" >'; var td5 = document.createElement("td"); td5.innerHTML = '< input type = "button" value = "移除" onclick = "del(this)" >'; tr.appendChild(th); tr.appendChild(td1); tr.appendChild(td2); tr.appendChild(td3); tr.appendChild(td4); tr.appendChild(td5); tbody.appendChild(tr); calculate(); } } </ script > </ head > < body > <!--这里写购物车代码--> < div > < table border = "1" width = "100%" > < thead > < tr > < th >< input type = "checkbox" onclick = "check(this)" ></ th > < th >图片</ th > < th >名称</ th > < th >价格</ th > < th >数量</ th > < th >移除</ th > </ tr > </ thead > < tbody id = "tb" > < tr > < th >< input type = "checkbox" onclick = "calculate()" ></ th > < td >商品1</ td > < td >< img src = "images/5a0cf6bfN92a5a597.jpg" width = "100" ></ td > < td >3000.00</ td > < td > < input type = "button" value = "-" onclick = "jian(this)" > < input type = "number" value = "1" > < input type = "button" value = "+" onclick = "jia(this)" > </ td > < td >< input type = "button" value = "移除" onclick = "del(this)" ></ td > </ tr > < tr > < th >< input type = "checkbox" onclick = "calculate()" ></ th > < td >商品2</ td > < td >< img src = "images/5a0cf672N3c785b7a.jpg" width = "100" ></ td > < td >2000.00</ td > < td > < input type = "button" value = "-" onclick = "jian(this)" > < input type = "number" value = "1" > < input type = "button" value = "+" onclick = "jia(this)" > </ td > < td >< input type = "button" value = "移除" onclick = "del(this)" ></ td > </ tr > </ tbody > < tfoot > < tr > < td colspan = "6" >总价< span id = "total" >0</ span > 元</ td > </ tr > </ tfoot > </ table > </ div > <!-- 商品列表 --> < div class = "row" > < div class = "col" > < p >< span >商品1</ span >价格:< span >3000.00</ span ></ p > < img src = "images/5a0cf6bfN92a5a597.jpg" > < input type = "button" value = "添加至购物车" onclick = "add(this)" > </ div > < div class = "col" > < p >< span >商品2</ span >价格:< span >2000.00</ span ></ p > < img src = "images/5a0cf672N3c785b7a.jpg" > < input type = "button" value = "添加至购物车" onclick = "add(this)" > </ div > < div class = "col" > < p >< span >商品3</ span >价格:< span >4000.00</ span ></ p > < img src = "images/5a1f5ed3Nfa577958.jpg" > < input type = "button" value = "添加至购物车" onclick = "add(this)" > </ div > < div class = "col" > < p >< span >商品4</ span >价格:< span >3500.00</ span ></ p > < img src = "images/5a1f5664Nfa934fac.jpg" > < input type = "button" value = "添加至购物车" onclick = "add(this)" > </ div > </ div > </ body > </ html > |
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原文链接:https://blog.csdn.net/qq_38454165/article/details/82424568