移动端事件有哪些:
触摸事件
手势事件
传感器事件
(后面两个兼容性不怎么样,因此重点就是触摸事件)
触摸事件:
touch 事件
pointer 事件
(PC端可能会使用jQuery做动画,移动端一般不会,基本都是使用css3做动画)
ontouchstart (必须在元素内部才能触发)
ontouchmove (元素内外都能触发)
ontouchend (元素内外都能触发)
ontouchcancel 触摸中断,多用于系统级处理,比如在触摸时突然接了个电话(一般几乎是用不上的)
推荐使用 addEventListener 来绑定事件,除非因为兼容性原因使用 on
touch.box{ width:200px; height:200px; background:pink; margin:20px auto; }" _ue_custom_node_="true">var box=document.getElementById("box");// box.ontouchstart=handleStart;// box.ontouchmove=handleMove;// box.ontouchend=handleEnd;box.addEventListener("touchstart",handleStart,false); box.addEventListener("touchmove",handleMove,false); box.addEventListener("touchend",handleEnd,false);function handleStart(){ console.log("touchstart"); }function handleMove(){ console.log("touchmove"); }function handleEnd(){ console.log("touchend"); }" _ue_custom_node_="true">
touch事件的event对象
比较重要的属性
type: "touchstart" 触发的事件
target: div#box.box 触摸的元素
changedTouches: TouchList {0: Touch, length: 1} 发生变化的触摸点
targetTouches: TouchList 目标元素上的触摸点
touches: TouchList {0: Touch, length: 1} 所有触摸点
<!DOCTYPE html><html lang="en"><head><meta charset="UTF-8"><title>touchtitle><style>.box{width:200px;height:200px;background:pink;margin:20px auto;}style>head><body><div class="box" id="box">div><script>var box=document.getElementById("box");// box.ontouchstart=handleStart;// box.ontouchmove=handleMove;// box.ontouchend=handleEnd;box.addEventListener("touchstart",handleStart,false); box.addEventListener("touchmove",handleMove,false); box.addEventListener("touchend",handleEnd,false);function handleStart(e){ console.log("touchstart"); console.log(e.changedTouches[0]); }function handleMove(e){ console.log("touchmove"); console.log(e); }function handleEnd(e){ console.log("touchend"); console.log(e); }script>body>html>
clientX clientY 指视口到触摸点的距离(不包括滚动距离)
pageX pageY 视口到触摸点的距离(包括滚动距离)
单指拖拽案例:
<!DOCTYPE html><html lang="en"><head><meta charset="UTF-8"><title>touchtitle><style>.backtop{width:90px;height:90px;position: fixed;bottom:20px;right:20px;line-height:90px;text-align: center;background:rgba(0,0,0,.6);border-radius:50%;color:#fff;font-size:60px;-webkit-tap-highlight-color:transparent;/*transform:translate3d(x,y,0);在移动端使用会开启GPU加速,会让动画性能变高*/}style>head><body><a href="#" id="backtop" class="backtop">↑a><script>function drag(el,options){ options.x=typeof options.x!=="undefined"?options.x:true; options.y=typeof options.y!=="undefined"?options.y:true;if(!options.x&&!options.y) return;var curPoint={ x:0, y:0};var startPoint={};var isTouchMove=false; el.addEventListener("touchstart",handleStart,false); el.addEventListener("touchmove",handleMove,false); el.addEventListener("touchend",handleEnd,false);function handleStart(e){var touch=e.changedTouches[0]; startPoint.x=touch.pageX; startPoint.y=touch.pageY; }function handleMove(e){ e.preventDefault();//阻止默认行为(滚动条滚动) isTouchMove=true;var touch=e.changedTouches[0];var diffPoint={};//要移动的距离var movePoint={//移动之后的距离 x:0, y:0}; diffPoint.x=touch.pageX-startPoint.x; diffPoint.y=touch.pageY-startPoint.y;if(options.x){ movePoint.x=diffPoint.x+curPoint.x;//移动之后的距离=要移动的距离+当前距离 }if(options.y){ movePoint.y=diffPoint.y+curPoint.y; } move(el,movePoint.x,movePoint.y); }function handleEnd(e){if(!isTouchMove) return;var touch=e.changedTouches[0]; curPoint.x+=touch.pageX-startPoint.x;//更新当前位置 curPoint.y+=touch.pageY-startPoint.y; isTouchMove=false; }function move(el,x,y){ x=x||0; y=y||0; el.style.transform="translate3d("+x+"px,"+y+"px,0)"; } }var backtop=document.getElementById("backtop"); drag(backtop,{ x:true, y:true});script>body>html>
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