• 移动端 触屏滑动条菜单(完善版 转)

    移动端 触屏滑动条菜单(完善版)

     
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    <!doctype html>
    <html>
    <head>
    <meta charset="utf-8">
    <meta name="viewport" content="width=320,user-scalable=no" />
     
    <title>菜单条</title>
    </head>
     
    <body>
     
    <style style='display:none' contentEditable>
    *{ margin:0; padding:0;}
    ul,li{ margin:0; padding:0; list-style:none;}
     
    #outer{ border:1px  solid red; 300px; height:46px; margin:20px auto; text-align:center; vertical-align:middle; line-height:46px; position:relative; overflow:hidden; background:#eee;}
    #outer:hover{ border-color:#333; cursor:pointer;}
    #inner{ position:absolute; left:0; top:1px; height:44px; line-height:44px; 300px; background:#666;  text-align:left; clear:both; overflow:hidden;}
    #inner li{ auto; height:44px; float:left; display:inline; padding:0 15px; text-align:center;  }
    #inner li:hover{ background:#333;}
    #inner li a{font-size:14px; color:#fff; display:inline;auto; height:44px; line-height:44px; text-decoration:none;}
    .translateZ{ -webkit-transform:translateZ(0);transform:translateZ(0);-webkit-backface-visibility: hidden;backface-visibility: hidden;}
     
    .classtest{ background:#333;}
    </style>
     
    <div id="outer">
        <ul id="inner" >
            <li><a href="">首页start</a></li>
            <li><a href="">美剧1</a></li>
            <li><a href="">电影1</a></li>
            <li><a href="">购物1</a></li>
            <li><a href="">时尚1</a></li>
            <li><a href="">新闻1</a></li>
            <li><a href="">其他1</a></li>
            <li><a href="">热点1</a></li>
            <li><a href="">电视1</a></li>
            <li><a href="">历史1</a></li>
             <li><a href="">首页2</a></li>
            <li><a href="">美剧2</a></li>
            <li><a href="">电影2</a></li>
            <li><a href="">购物2</a></li>
            <li><a href="">时尚2</a></li>
            <li><a href="">新闻2</a></li>
            <li><a href="">其他2</a></li>
            <li><a href="">热点2</a></li>
            <li><a href="">电视2</a></li>
            <li><a href="">结尾end</a></li>
        </ul>
    </div>
     
     
    touches：当前屏幕上所有手指的列表
    targetTouches：当前dom元素上手指的列表，尽量使用这个代替touches
    changedTouches：涉及当前事件的手指的列表，尽量使用这个代替touches
    <script src="../js/jquery-1.9.1.min.js"></script>
    <script>
    window.onload=function(){
      
        function getStyle(obj,attr){
           return obj.currentStyle? obj.currentStyle[attr]:getComputedStyle(obj,false)[attr];
           }
         
       var support = document.body.classList==undefined ? false : true ;
        
       var outer=document.getElementById("outer");
          var inner=document.getElementById("inner");
       var li=inner.getElementsByTagName("li");
       var innerWd=0,i=0;
       for(;i<li.length;i++){
         innerWd+=li[i].offsetWidth;
       }
       inner.style.width=innerWd+'px';
          
         
       var startX=0;
       var alls=0;
       var moveLeft=0;
       var iSpeedX = 0;
       var prevX = 0;
       var timer = null;
       var resetStartX=true;
       var maxDistance=parseInt(outer.offsetWidth-innerWd); //最大滑动距离
        
       inner.addEventListener("touchstart",start,false);
       function start(e){
         if(inner.offsetWidth<outer.offsetWidth)return;//如果内部元素小于外框 不需要滑动
     
         var e=e||window.event;
                       e.preventDefault();
          var   touchs=e.touches[0],
                   resetStartX=true;;
                //startX=prevX=touchs.pageX;
          startX=touchs.pageX;
                prevX=touchs.pageX;
        
             alls=this.offsetLeft;
        
            inner.addEventListener("touchmove",move,false);
            inner.addEventListener("touchend",end,false);
         
        }
        
        function move(e){
       var e=e||window.event;
       if (e.touches.length > 1 || e.scale && e.scale !== 1) return; // 当屏幕有多个touch或者页面被缩放过，就不执行move操作
       var touchs=e.changedTouches[0];
        
            iSpeedX = touchs.pageX - prevX;//获取出手一瞬间的速度
         prevX = touchs.pageX;//当前的始终覆盖上一个
         moveLeft=touchs.pageX-startX;
       
         var that=this;
           
         if(that.offsetLeft>=0){
            if(resetStartX){
          startX=touchs.pageX;
          resetStartX=false;
          }
          that.style.left=moveLeft/3+alls+'px';
           
       }else if(that.offsetLeft<=maxDistance){
        if(resetStartX){
          startX=touchs.pageX;
          resetStartX=false;
          }
          that.style.left=moveLeft/3+alls+'px';
          
       }else{
           that.style.left=moveLeft+alls+'px';   
          }
          
         //this.style.webkitTransform='translateZ(0)'; //移动时候  缓存到GPU层
         that.classList.add('translateZ'); //classList 对已经增加的样式 不在判断是否添加  GPU缓存hack
         e.preventDefault();
        }
        
        function end(){
       
       var self=this;
       clearInterval(timer);
        
       timer=setInterval(function(){
            
          if(Math.abs(iSpeedX)<=1||self.offsetLeft>50||self.offsetLeft<maxDistance-50){
              clearInterval(timer);
            //if(self.classList.contains('translateZ')){  //滚动停止 结束时候回收GPU 垃圾
    //                           // self.classList.remove('translateZ'); //不知道怎么删除这样样式 
    //         // self.setAttribute("class",'');
    //                         }
     
                               if(self.offsetLeft>=0){
             $(inner).animate({left:0},300,function(){
              self.classList.remove('translateZ');   //移除PGU hack
              });
              }
             if(self.offsetLeft<maxDistance){  
             $(inner).animate({left:maxDistance+'px'},300,function(){
               self.classList.remove('translateZ');   //移除PGU hack
               });
             }
                 
          }else{
               iSpeedX *= 0.95;
         self.style.left = parseInt(self.offsetLeft + iSpeedX) + 'px';
         }
        },20);
        
       
         self.removeEventListener("touchmove",move,false);
         self.removeEventListener("touchend",end,false);
         //self.style.webkitTransform='';   
       }
        
       
    }
      
    </script>
    </body>
    </html>
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    优化滑动 setTimeout 相对减少时间计数

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    function end(){
             
             var self=this;
             clearTimeout(timer);
              
             timer=setTimeout(function(){
                     
                      if(Math.abs(iSpeedX)<=1||self.offsetLeft>50||self.offsetLeft<maxDistance-50){
                             clearTimeout(timer);
                                 //if(self.classList.contains('translateZ')){  //滚动停止 结束时候回收GPU 垃圾
    //                               // self.classList.remove('translateZ'); //不知道怎么删除这样样式 
    //                               // self.setAttribute("class",'');
    //                             }
                              
     
                               if(self.offsetLeft>=0){
                                  $(inner).animate({left:0},300,function(){
                                      self.classList.remove('translateZ');   //移除PGU hack
                                      });
                                }
                               if(self.offsetLeft<maxDistance){  
                               $(inner).animate({left:maxDistance+'px'},300,function(){
                                    self.classList.remove('translateZ');   //移除PGU hack
                                    });
                               }
                                         
                      }else{
                        iSpeedX *= 0.95;
                        self.style.left = parseInt(self.offsetLeft + iSpeedX) + 'px';
                            console.log('setTimeoutsss');
                        setTimeout(arguments.callee,16)
                     }
                 },16);
              
             
            self.removeEventListener("touchmove",move,false);
            self.removeEventListener("touchend",end,false);
            //self.style.webkitTransform='';     
          }
          

    　　

    优化滑动  requestAnimationFrame 大幅减少时间计数

    复制代码
           function end(){
        
         var self=this,
         stopFlag=null;
          
               function  sliderMove(){ 
                  if(Math.abs(iSpeedX)<=1||self.offsetLeft>50||self.offsetLeft<maxDistance-50){
                          
                           if(self.offsetLeft>=0){
                              $(inner).animate({left:0},300,function(){
                                  self.classList.remove('translateZ');   //移除PGU hack
                                  }); 
                            } 
                           if(self.offsetLeft<maxDistance){   
                           $(inner).animate({left:maxDistance+'px'},300,function(){
                                self.classList.remove('translateZ');   //移除PGU hack
                                }); 
                           }
                            window.cancelAnimationFrame(stopFlag);//可以取消该次动画
                            stopFlag=null;
                            sliderMove=null;  //清空对象
                          console.log('requestAnimationFramessss'+sliderMove);
                                    
                  }else{
                    iSpeedX *= 0.95;
                     self.style.left = parseInt(self.offsetLeft + iSpeedX) + 'px';
                    console.log('滑动时候requestAnimationFrame次数');
                    stopFlag=requestAnimationFrame(arguments.callee);
                 }
               }
         sliderMove();
        
        self.removeEventListener("touchmove",move,false);
        self.removeEventListener("touchend",end,false); 
        //self.style.webkitTransform='';       
      }
    复制代码

    requestAnimationFrame兼容处理：

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    ;(function() {
        var lastTime = 0;
        var vendors = ['ms', 'moz', 'webkit', 'o'];
        for (var x = 0; x < vendors.length && !window.requestAnimationFrame; ++x) {
            window.requestAnimationFrame = window[vendors[x] + 'RequestAnimationFrame'];
            window.cancelAnimationFrame = window[vendors[x] + 'CancelAnimationFrame'] || window[vendors[x] + 'CancelRequestAnimationFrame'];
        }
        if (!window.requestAnimationFrame) window.requestAnimationFrame = function(callback, element) {
            var currTime = new Date().getTime();
            var timeToCall = Math.max(0, 16 - (currTime - lastTime));
            var id = window.setTimeout(function() {
                callback(currTime + timeToCall);
            }, timeToCall);
            lastTime = currTime + timeToCall;
            return id;
        };
        if (!window.cancelAnimationFrame) window.cancelAnimationFrame = function(id) {
            clearTimeout(id);
        };
    }());
     
     
     
    // requestAnimationFrame polyfill by Erik Möller.
    // Fixes from Paul Irish, Tino Zijdel, Andrew Mao, Klemen Slavič, Darius Bacon
    // MIT license
    if (!Date.now)
      Date.now = function() { return new Date().getTime(); };
    (function() {
      'use strict';
      var vendors = ['webkit', 'moz'];
      for (var i = 0; i < vendors.length && !window.requestAnimationFrame; ++i) {
        var vp = vendors[i];
        window.requestAnimationFrame = window[vp+'RequestAnimationFrame'];
        window.cancelAnimationFrame = (window[vp+'CancelAnimationFrame']
                       || window[vp+'CancelRequestAnimationFrame']);
      }
      if (/iP(ad|hone|od).*OS 6/.test(window.navigator.userAgent) // iOS6 is buggy
        || !window.requestAnimationFrame || !window.cancelAnimationFrame) {
        var lastTime = 0;
        window.requestAnimationFrame = function(callback) {
          var now = Date.now();
          var nextTime = Math.max(lastTime + 16, now);
          return setTimeout(function() { callback(lastTime = nextTime); },
                    nextTime - now);
        };
        window.cancelAnimationFrame = clearTimeout;
      }
    }());

    　　
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  • 原文地址：https://www.cnblogs.com/sunshq/p/5017170.html
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