touch.js 拖動、縮放、旋轉(zhuǎn) （鼠標手勢）功能代碼

var cat = window.cat || {}; 
cat.touchjs = { 
  left: 0, 
  top: 0, 
  scaleVal: 1,  //縮放 
  rotateVal: 0,  //旋轉(zhuǎn) 
  curStatus: 0,  //記錄當前手勢的狀態(tài), 0:拖動, 1:縮放, 2:旋轉(zhuǎn) 
  //初始化 
  init: function ($targetObj, callback) { 
    touch.on($targetObj, 'touchstart', function (ev) { 
      cat.touchjs.curStatus = 0; 
      ev.preventDefault();//阻止默認事件 
    }); 
    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); 
    } 
  }, 
  //拖動 
  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); 
    }); 
  }, 
  //縮放 
  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); 
    }); 
  }, 
  //旋轉(zhuǎn) 
  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 > 
 <img id="targetObj"  src="https://cache.yisu.com/upload/information/20200622/114/77432.jpg" /> 
</div>

var $targetObj = $('#targetObj'); 
//初始化設(shè)置 
cat.touchjs.init($targetObj, function (left, top, scale, rotate) {}; 
//初始化拖動手勢（不需要就注釋掉） 
cat.touchjs.drag($targetObj, function (left, top) { }); 
//初始化縮放手勢（不需要就注釋掉） 
cat.touchjs.scale($targetObj, function (scale) { }); 
//初始化旋轉(zhuǎn)手勢（不需要就注釋掉） 
cat.touchjs.rotate($targetObj, function (rotate) { });