touch.js 拖动、缩放、旋转 （鼠标手势）功能代码

 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); }); } }; 

 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) { });