web移动端触摸事件的范例~~~
注意：1.如果不是内联元素，获取style的属性值前需先赋值~不然为Null.
2.亲测andriod 手机 MX4内置浏览器运行妥妥的~~但是微信浏览器并不支持~原因未找到。
1 <!DOCTYPE html> 2 <html> 3 <head> 4 <meta http-equiv="Content-Type" Content="text/html; charset=utf-8;"> 5 <title>web移动端触摸滑动事件</title> 6 <meta name="description" content="web移动端触摸滑动事件"/> 7 <meta name="viewport" content="user-scalable=no"> 8 </head> 9 <body>10 <div style="position:relative;left:10px;top:10px;height: 100px;width: 200px;background: blue;" id="slider"></div>11 <script>12 var slider = {13 //判断设备是否支持touch事件14 touch: ('ontouchstart' in window) || window.DocumentTouch && document instanceof DocumentTouch,15 slider: document.getElementById('slider'),16 //事件17 events: {18 slider: this.slider, //this为slider对象19 handleEvent: function (event) {20 var self = this; //this指events对象21 if (event.type == 'touchstart') {22 self.start(event);23 } else if (event.type == 'touchmove') {24 self.move(event);25 } else if (event.type == 'touchend') {26 self.end(event);27 }28 },29 //touchstart30 start: function (event) {31 event.preventDefault(); //阻止浏览器的默认事件32 var touch = event.targetTouches[0]; //touches数组对象获得屏幕上所有的touch，取第一个touch33 startPos = {x: touch.clientX, y: touch.clientY}; //取第一个touch的坐标值34 sliderX = parseInt(this.slider.style.left); //获取触摸时滑动块的初始位置35 sliderY = parseInt(this.slider.style.top);36 this.slider.addEventListener('touchmove', this, false);37 this.slider.addEventListener('touchend', this, false);38 },39 //touchmove40 move: function (event) {41 //当屏幕有多个touch或者页面被缩放过，就不执行move操作42 if (event.targetTouches.length > 1 || event.scale && event.scale !== 1) return;43 var touch = event.targetTouches[0];44 endPos = {x: touch.clientX - startPos.x, y: touch.clientY - startPos.y}; //获取所移动的距离45 event.preventDefault(); //阻止触摸事件的默认行为，即阻止滚屏46 this.slider.style.left = (sliderX + endPos.x ) + 'px';47 this.slider.style.top = (sliderY + endPos.y) + 'px';48 49 },50 //滑动释放51 end: function (event) {52 //解绑事件53 this.slider.removeEventListener('touchmove', this, false);54 this.slider.removeEventListener('touchend', this, false);55 }56 },57 58 //初始化59 init: function () {60 var self = this; //this指slider对象61 if (!!self.touch) self.slider.addEventListener('touchstart', self.events, false); //addEventListener第二个参数可以传一个对象，会调用该对象的handleEvent属性62 }63 };64 slider.init();65 </script>66 </body>67 </html>
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