移动设备手势事件库Touch.js使用详解
Touch.js手势库是专门在Webkit内核浏览器的移动设备中使用中设计的,Touch.js是移动设备上的手势识别与事件库。Touch.js基于原生事件,支持事件代理,性能更好，极简的API,秒速上手等优势。
1、旋转事件-startRotate
varangle=0;
touch.on('#target','touchstart',function(ev){
ev.startRotate();
ev.preventDefault();
});
touch.on('#target','rotate',function(ev){
vartotalAngle=angle+ev.rotation;
if(ev.fingerStatus==='end'){
angle=angle+ev.rotation;
}
this.style.webkitTransform='rotate('+totalAngle+'deg)';
});
2、双指缩放事件-Scale
vartarget=document.getElementById("target");
target.style.webkitTransition='allease0.05s';
touch.on('#target','touchstart',function(ev){
ev.preventDefault();
});
varinitialScale=1;
varcurrentScale;
touch.on('#target','pinchend',function(ev){
currentScale=ev.scale-1;
currentScale=initialScale+currentScale;
currentScale=currentScale>2?2:currentScale;
currentScale=currentScale<1?1:currentScale;
this.style.webkitTransform='scale('+currentScale+')';
log("当前缩放比例为:"+currentScale+".");
});
touch.on('#target','pinchend',function(ev){
initialScale=currentScale;
});
3、识别单击,双击和长按事件-Tap&Hold
touch.on('#target','holdtapdoubletap',function(ev){
//console.log(ev.type);
});
4、向左,向右滑动-Swipe
touch.on('#target','touchstart',function(ev){
ev.preventDefault();
});
vartarget=document.getElementById("target");
target.style.webkitTransition='allease0.2s';
touch.on(target,'swiperight',function(ev){
this.style.webkitTransform="translate3d("+rt+"px,0,0)";
log("向右滑动.");
});
touch.on(target,'swipeleft',function(ev){
log("向左滑动.");
this.style.webkitTransform="translate3d(-"+this.offsetLeft+"px,0,0)";
});
5、拖拽事件-Drag
touch.on('#target','touchstart',function(ev){
ev.preventDefault();
});
vartarget=document.getElementById("target");
vardx,dy;
touch.on('#target','drag',function(ev){
dx=dx||0;
dy=dy||0;
log("当前x值为:"+dx+",当前y值为:"+dy+".");
varoffx=dx+ev.x+"px";
varoffy=dy+ev.y+"px";
this.style.webkitTransform="translate3d("+offx+","+offy+",0)";
});
touch.on('#target','dragend',function(ev){
dx+=ev.x;
dy+=ev.y;
});
6、原生事件-Touch
touch.on('#target','touchstarttouchmovetouchend',function(ev){
console.log(ev.type);
});
touch.js官方网站：http://touch.code.baidu.com/
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