var cat = window.cat || {};

cat.touchjs = {

    left: 0,

    top: 0,

    scaleVal: 1,    //缩放

    rotateVal: 0,   //旋转

    curStatus: 0,   //记录当前手势的状态, 0:拖动, 1:缩放, 2:旋转

    //初始化

    init: function ($targetObj, callback) {

        touch.on($targetObj, 'touchstart', function (ev) {

            cat.touchjs.curStatus = 0;

            ev.preventDefault();//阻止默认事件

        });

        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);

        }

    },

    //拖动

    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);

        });

    },

    //缩放

    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);

        });

    },

    //旋转

    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');

//初始化设置

cat.touchjs.init($targetObj, function (left, top, scale, rotate) {};

//初始化拖动手势（不需要就注释掉）

cat.touchjs.drag($targetObj, function (left, top) { });

//初始化缩放手势（不需要就注释掉）

cat.touchjs.scale($targetObj, function (scale) { });

//初始化旋转手势（不需要就注释掉）

cat.touchjs.rotate($targetObj, function (rotate) { });