var cat = window.cat || {}; cat.touchjs = {   left: 0,   top: 0,   scaleVal: 1,  //縮放   rotateVal: 0,  //旋轉   curStatus: 0,  //記錄當前手勢的狀態, 0:拖動, 1:縮放, 2:旋轉   //初始化   init: function ($targetObj, callback) {     touch.on($targetObj, 'touchstart', function (ev) {       cat.touchjs.curStatus = 0;       ev.preventDefault();//阻止默認事件     });     if (!window.localStorage.cat_touchjs_data)       callback(0, 0, 1, 0);     else {       var jsonObj = JSON.parse(window.localStorage.cat_touchjs_data);       cat.touchjs.left = parseFloat(jsonObj.left), cat.touchjs.top = parseFloat(jsonObj.top), cat.touchjs.scaleVal = parseFloat(jsonObj.scale), cat.touchjs.rotateVal = parseFloat(jsonObj.rotate);       callback(cat.touchjs.left, cat.touchjs.top, cat.touchjs.scaleVal, cat.touchjs.rotateVal);     }   },   //拖動   drag: function ($targetObj, callback) {     touch.on($targetObj, 'drag', function (ev) {       $targetObj.css("left", cat.touchjs.left + ev.x).css("top", cat.touchjs.top + ev.y);     });     touch.on($targetObj, 'dragend', function (ev) {       cat.touchjs.left = cat.touchjs.left + ev.x;       cat.touchjs.top = cat.touchjs.top + ev.y;       callback(cat.touchjs.left, cat.touchjs.top);     });   },   //縮放   scale: function ($targetObj, callback) {     var initialScale = cat.touchjs.scaleVal || 1;     var currentScale;     touch.on($targetObj, 'pinch', function (ev) {       if (cat.touchjs.curStatus == 2) {         return;       }       cat.touchjs.curStatus = 1;       currentScale = ev.scale - 1;       currentScale = initialScale + currentScale;       cat.touchjs.scaleVal = currentScale;       var transformStyle = 'scale(' + cat.touchjs.scaleVal + ') rotate(' + cat.touchjs.rotateVal + 'deg)';       $targetObj.css("transform", transformStyle).css("-webkit-transform", transformStyle);       callback(cat.touchjs.scaleVal);     });     touch.on($targetObj, 'pinchend', function (ev) {       if (cat.touchjs.curStatus == 2) {         return;       }       initialScale = currentScale;       cat.touchjs.scaleVal = currentScale;       callback(cat.touchjs.scaleVal);     });   },   //旋轉   rotate: function ($targetObj, callback) {     var angle = cat.touchjs.rotateVal || 0;     touch.on($targetObj, 'rotate', function (ev) {       if (cat.touchjs.curStatus == 1) {         return;       }       cat.touchjs.curStatus = 2;       var totalAngle = angle + ev.rotation;       if (ev.fingerStatus === 'end') {         angle = angle + ev.rotation;       }       cat.touchjs.rotateVal = totalAngle;       var transformStyle = 'scale(' + cat.touchjs.scaleVal + ') rotate(' + cat.touchjs.rotateVal + 'deg)';       $targetObj.css("transform", transformStyle).css("-webkit-transform", transformStyle);       $targetObj.attr('data-rotate', cat.touchjs.rotateVal);       callback(cat.touchjs.rotateVal);     });   } }; 

<div style="position:relative;width: 100%;height: 250px;overflow: hidden;border: 1px dashed #ff0000;">  <img id="targetObj" style="position:relative;transform-origin:center" src="http://demo.somethingwhat.com/images/flower1.jpg" /> </div>

var $targetObj = $('#targetObj'); //初始化設置 cat.touchjs.init($targetObj, function (left, top, scale, rotate) {}; //初始化拖動手勢（不需要就注釋掉） cat.touchjs.drag($targetObj, function (left, top) { }); //初始化縮放手勢（不需要就注釋掉） cat.touchjs.scale($targetObj, function (scale) { }); //初始化旋轉手勢（不需要就注釋掉） cat.touchjs.rotate($targetObj, function (rotate) { });