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This article introduces the knowledge of "how to realize the shopping cart function of native js". In the operation of actual cases, many people will encounter such a dilemma, so let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

* add or subtract the number of items in the shopping cart. Note that the quantity is at least 1, and the quantity input can only be a number.

* implement the removal of shopping cart items

* you can design several more product information on the same page, each item has a price, picture, name, and add to the shopping cart button, click the button to add to the shopping cart

* to calculate the total price of shopping cart goods

Commodity 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 } 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[xss_clean][xss_clean]; var tbody = tr[xss_clean]; tbody.removeChild(tr); calculate(); } // 增加商品数量 function jia(me) { var td = me[xss_clean]; 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[xss_clean]; 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) {/ / change the value of the text box num.value = r; calculate ();}} / / change the selected state of the check box function check (me) {var tbody = document.getElementById ("tb") only if the reduced result is greater than or equal to 1 Var inputs = tbody.querySelectorAll ("th input"); for (var I = 0; I commodity 1

3000.00 Commodity 2

2000.00

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