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javascript實(shí)現(xiàn)左滑刪除的方法：1、計(jì)算根節(jié)點(diǎn)HTML的字體大?。?、初始化根節(jié)點(diǎn)HTML的字體大??；3、設(shè)置側(cè)滑顯示刪除按鈕；4、通過(guò)“event.preventDefault()…”實(shí)現(xiàn)左滑刪除即可。
本文操作環(huán)境：windows7系統(tǒng)、javascript1.8.5版、Dell G3電腦。
javascript怎么實(shí)現(xiàn)左滑刪除？
純 js左滑刪除功能
代碼如下：
<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no"> <title>js側(cè)滑顯示刪除按鈕</title> <style> *{margin:0;padding:0;} body{font-size:.14rem;} li{list-style:none;} i{font-style:normal;} a{color:#393939;text-decoration:none;} .list{overflow:hidden;margin-top:.2rem;padding-left:.3rem;border-top:1px solid #ddd;} .list li{overflow:hidden;width:120%;border-bottom:1px solid #ddd;} .list li a{display:block;height:.88rem;line-height:.88rem;-webkit-transition:all 0.3s linear;transition:all 0.3s linear;} .list li i{float:right;width:15%;text-align:center;background:#E2421B;color:#fff;} .swipeleft{transform:translateX(-15%);-webkit-transform:translateX(-15%);} </style> <script> //計(jì)算根節(jié)點(diǎn)HTML的字體大小 function resizeRoot(){ var deviceWidth = document.documentElement.clientWidth, num = 750, num1 = num / 100; if(deviceWidth > num){ deviceWidth = num; } document.documentElement.style.fontSize = deviceWidth / num1 + "px"; } //根節(jié)點(diǎn)HTML的字體大小初始化 resizeRoot(); window.onresize = function(){ resizeRoot(); }; </script> </head> <body> <section> <div class="list"> <ul> <li><a href="#">側(cè)滑顯示刪除按鈕1<i>刪除</i></a></li> <li><a href="#">側(cè)滑顯示刪除按鈕2<i>刪除</i></a></li> <li><a href="#">側(cè)滑顯示刪除按鈕3<i>刪除</i></a></li> </ul> </div> <script> //側(cè)滑顯示刪除按鈕 var expansion = null; //是否存在展開(kāi)的list var container = document.querySelectorAll('.list li a'); for(var i = 0; i < container.length; i++){ var x, y, X, Y, swipeX, swipeY; container[i].addEventListener('touchstart', function(event) { x = event.changedTouches[0].pageX; y = event.changedTouches[0].pageY; swipeX = true; swipeY = true ; if(expansion){ //判斷是否展開(kāi)，如果展開(kāi)則收起 expansion.className = ""; } }); container[i].addEventListener('touchmove', function(event){ X = event.changedTouches[0].pageX; Y = event.changedTouches[0].pageY; // 左右滑動(dòng) if(swipeX && Math.abs(X - x) - Math.abs(Y - y) > 0){ // 阻止事件冒泡 event.stopPropagation(); if(X - x > 10){ //右滑 event.preventDefault(); this.className = ""; //右滑收起 } if(x - X > 10){ //左滑 event.preventDefault(); this.className = "swipeleft"; //左滑展開(kāi) expansion = this; } swipeY = false; } // 上下滑動(dòng) if(swipeY && Math.abs(X - x) - Math.abs(Y - y) < 0) { swipeX = false; } }); } </script> </body> </html>
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