图片手势放大+hammer.js

 //图片手势放大
            var reqAnimationFrame = (function() {
                return window[Hammer.prefixed(window, 'requestAnimationFrame')] || function(callback) {
                    window.setTimeout(callback, 1000 / 60);
                };
            })();
            var el = $('img');
            var ticking = false;
            var transform;
            var initScale = 1;
            var _eImg = '';
            for (var m = 0; m < el.length; m++) {
                var mc = new Hammer.Manager(el[m]);
                mc.add(new Hammer.Pan({
                    threshold: 0,
                    pointers: 0
                }));
                mc.add(new Hammer.Swipe()).recognizeWith(mc.get('pan'));
                mc.add(new Hammer.Pinch({
                    threshold: 0
                })).recognizeWith(mc.get('pan'));
                mc.on('panstart panmove', onPan);
                mc.on('pinchstart pinchmove', onPinch);
                mc.on('swipe', onSwipe);
            }

            function resetElement() {
                el.addClass('animate');
                transform = {
                    translate: {
                        x: 0,
                        y: 0
                    },
                    scale: 1,
                    angle: 0,
                    rx: 0,
                    ry: 0,
                    rz: 0
                };
                requestElementUpdate();
            }

            function updateElementTransform() {
                var value = ['translate3d(' + transform.translate.x + 'px, ' + transform.translate.y + 'px, 0)', 'scale(' + transform.scale + ', ' + transform.scale + ')', 'rotate3d(' + transform.rx + ',' + transform.ry + ',' + transform.rz + ',' + transform.angle + 'deg)'];
                value = value.join(' ');
                if (_eImg != '') {
                    _eImg.style.webkitTransform = value;
                    _eImg.style.mozTransform = value;
                    _eImg.style.transform = value;
                    //_eImg.css({ 'transform': value }, { '-webkit-transform': value });
                }
                ticking = false;
            }

            function requestElementUpdate() {
                if (!ticking) {
                    reqAnimationFrame(updateElementTransform);
                    ticking = true;
                }
            }

            function onPan(ev) {
                el.removeClass('animate');
                transform.translate = {
                    x: ev.deltaX,
                    y: ev.deltaY
                };
            }

            function onPinch(ev) {
                if (ev.type == 'pinchstart') {
                    initScale = transform.scale || 1;
                }
                el.removeClass('animate');
                transform.scale = initScale * ev.scale;
                requestElementUpdate();
                _eImg = ev.target;
                return _eImg;
            }

            function onSwipe(ev) {
                var angle = 10;
                transform.ry = (ev.direction & Hammer.DIRECTION_HORIZONTAL) ? 1 : 0;
                transform.rx = (ev.direction & Hammer.DIRECTION_VERTICAL) ? 1 : 0;
                transform.angle = (ev.direction & (Hammer.DIRECTION_RIGHT | Hammer.DIRECTION_UP)) ? angle : -angle;
                requestElementUpdate();
                _eImg = ev.target;
                return _eImg;
            }
            resetElement();