本文实例为大家分享了hammer.js实现图片手势放大效果的具体代码，供大家参考，具体内容如下
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);
}
原文链接：https://www.f2er.com/js/36764.html 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();