移动端事件笔记

  移动端主要的事件有:touchstart、touchmove、touchend、touchcancel、gesturestart、gesturechange、gestureend

  前四者为触摸事件,后者为手势事件,其中需要注意的是touchstart -> touchmove -> touchend -> click的顺序。并且触发了touchmove事件就不会触发click事件

  触摸事件的event提供了如下属性:

移动端事件笔记

  对于手势事件,还提供了event.scale 和 event.rotation两个特别有用的属性。

  具体的使用在下面代码

<!DOCTYPE html>

<html lang="en">

<head>

    <meta charset="UTF-8"/>

    <meta name="viewport" content="width=device-width, initial-scale=1, user-scalable=no, minimal-ui" />

    <meta name="apple-mobile-web-app-capable" content="yes" />

    <meta name="apple-mobile-web-app-status-bar-style" content="black" />

    <meta name="format-detection"content="telephone=no, email=no" />

    <title>Mobile touch event</title>

    <style>

        html,body,#canvas{

            width: 100%;

            height: 100%;            

            padding: 0;

            margin: 0;

        }        

        #canvas{

            position: relative;

            background-color: #ccc;

        }

        .spirit{

            position: absolute;

            background-color: #f30;

            display: block;

        }

    </style>

</head>

<body>

    <div id="canvas"></div>

    <script>

    var canvas = document.getElementById('canvas'),spirit,startScale,startRotation;



    var touchstartFun = function(e){

        e.preventDefault();

        if(!spirit && e.touches.length >1){

            var sPoint = e.touches[0];

            var ePoint = e.touches[1];            

            spirit     = document.createElement('div') ;

            spirit.className    = 'spirit';

            spirit.style.left   = Math.min(sPoint.pageX,ePoint.pageX) + 'px';

            spirit.style.top    = Math.min(sPoint.pageY,ePoint.pageY) + 'px';

            spirit.style.width  = Math.abs(sPoint.pageX - ePoint.pageX) + 'px';

            spirit.style.height = Math.abs(sPoint.pageY - ePoint.pageY) + 'px';

            canvas.appendChild(spirit);



        }

    };



    var gesturestartFun = function(e){

        e.preventDefault();

    };



    var gesturechangestureendFun = function(e){

        e.preventDefault();

        if(startRotation == null || startScale == null){

            startScale    = 0;

            startRotation = 0;            

        }else{

            spirit.style.webkitTransform = 'scale('+ (e.scale + startScale) +') rotate('+ (e.rotation + startRotation) +'deg)'

        }

    };



    var gestureendFun = function(e){

        e.preventDefault();

        canvas.removeChild(spirit);

        spirit        = null;

        startScale    = null;

        startRotation = null;

    };



    //必须填false,不填写默认应该也是false,但是手机端必须填false!

    canvas.addEventListener('touchstart',touchstartFun,false);

    canvas.addEventListener('gesturestart',gesturestartFun,false);

    canvas.addEventListener('gesturechange',gesturechangestureendFun,false);

    canvas.addEventListener('gestureend',gestureendFun,false);

    

    var orientationchangestureendFun = function(){

        switch(window.orientation) {

      case 0: 

            alert("肖像模式 0,screen-width: " + screen.width + "; screen-height:" + screen.height);

            break;

      case -90: 

            alert("左旋 -90,screen-width: " + screen.width + "; screen-height:" + screen.height);

            break;

      case 90:   

            alert("右旋 90,screen-width: " + screen.width + "; screen-height:" + screen.height);

            break;

      case 180:   

          alert("风景模式 180,screen-width: " + screen.width + "; screen-height:" + screen.height);

          break;

    };

    };



    //window.addEventListener('orientationchange',orientationchangestureendFun,false);

    window.onorientationchange = orientationchangestureendFun;

    </script>

</body>

</html>

 

你可能感兴趣的:(移动端)