JS小应用:商品筛选。
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Document</title> <style type="text/css"> * { margin: 0; padding: 0; list-style: none; text-decoration: none; } .choose { width: 500px; height: auto; margin: auto; } .choose nav { height: 50px; background-color: red; } .choose nav span { margin: 0 5px; } .choose .show { color: red; } .choose ul li { border: 1px solid black; } .choose ul li a { box-sizing: border-box; display: inline-block; width: 40px; border-left: 1px solid black; margin: 5px; padding-left: 5px; } </style> </head> <body> <div class="choose"> <nav></nav> <ul> <li> <strong>手机:</strong> <a href="javascript:;">小米</a> <a href="javascript:;">华为</a> <a href="javascript:;">apple</a> <a href="javascript:;">OPPO</a> <a href="javascript:;">vivo</a> </li> <li> <strong>价格:</strong> <a href="javascript:;">3200</a> <a href="javascript:;">2600</a> <a href="javascript:;">899</a> <a href="javascript:;">2799</a> <a href="javascript:;">2299</a> </li> <li> <strong>屏幕:</strong> <a href="javascript:;">399</a> <a href="javascript:;">600</a> <a href="javascript:;">800</a> <a href="javascript:;">1200</a> </li> </ul> </div> <script type="text/javascript"> var li = document.querySelectorAll('li'); var stack = []; //存放三个类别的option for (var i = 0; i < li.length; i++) { // 获取每个li中的option进行处理 var options = li[i].querySelectorAll("a"); for (var j = 0; j < options.length; j++) { // 当选项被点击时,传入点击的类别是第几个li的 // options[j].onclick = Aclick.bind(options[j], [i]); //1. 将点击事件分离出去 options[j].onclick = Bclick(i); //2. 将点击事件分离出去 } } </script> </body> </html>
当写到这里的时候想要把这个事件函数分离出去,但是有参数。于是问题出现
如何将一个带参数的事件函数分离出去???
于是乎:就有了以下两种方法
1、使用bind改变this指向后返回一个不执行的函数
function Aclick(index) { // 删掉nav var choose = document.querySelector('.choose'); var nav = document.querySelector(".choose nav"); choose.removeChild(nav); // 使用stack重新添加 stack[index] = this.innerHTML; var nav = document.createElement("nav"); for (k = 0; k < stack.length; k++) { if (stack[k] != "" && stack[k] != undefined) { //略过stack中的空项,重新向nav中添加span var span = document.createElement("span"); var a = document.createElement("a"); a.innerHTML = "X"; a.href = "javascript:void(0);"; span.innerHTML = stack[k]; a.onclick = function() { stack[index] = ""; nav.removeChild(this.parentNode); } span.appendChild(a); nav.appendChild(span); } } choose.insertBefore(nav, choose.children[0]); }
2、在注册函数外面套一层函数将注册函数返回。
function Bclick(index) { return function() { // 删掉nav var choose = document.querySelector('.choose'); var nav = document.querySelector(".choose nav"); choose.removeChild(nav); // 使用stack重新添加 stack[index] = this.innerHTML; var nav = document.createElement("nav"); for (k = 0; k < stack.length; k++) { if (stack[k] != "" && stack[k] != undefined) { //略过stack中的空项,重新向nav中添加span var span = document.createElement("span"); var a = document.createElement("a"); a.innerHTML = "X"; a.href = "javascript:void(0);"; span.innerHTML = stack[k]; a.onclick = function() { stack[index] = ""; nav.removeChild(this.parentNode); } span.appendChild(a); nav.appendChild(span); } } choose.insertBefore(nav, choose.children[0]); } }
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