可以实现手势操作：拖动、缩放、旋转。封装好的脚本方法是这样的：
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);
});
}
};
html代码：
<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>
js调用：
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) { });
以上所述是小编给大家介绍的touch.js 拖动、缩放、旋转 （鼠标手势）功能代码，希望对大家有所帮助，如果大家有任何疑问请给我留言，小编会及时回复大家的。在此也非常感谢大家对的支持！
更多touch.js 拖动、缩放、旋转 （鼠标手势）功能代码。