MouseFollower.js 实现了鼠标跟随的物体转动效果，类似 Linux 下的大眼睛。

MouseFollower = (function(){      var store = [],         //contains an object with an element & invert property          xdeg = ydeg = 0,    //the current rotationAngles of the cube that is currently being handled          sPos = {},          //relative pos on screen, seen from the document          invert = 1;         //look to the mouse cursor or away from it        document.body.onmousemove = followElements;        /* helper functions*/      function prefixStyle(el,p,style){          var prefixes = ["webkit","moz","o",""],                  i = 0;          p = p.charAt(0).toUpperCase() + p.slice(1);          [].forEach.call(prefixes, function(prefix){              if( prefix == ""){                  p = p.charAt(0).toLowerCase() + p.slice(1);                  el.style[prefix + p] = style;                 }else{                  el.style[prefix + p] = style;                 }            });      }      function posOnScreen(el){          return el.getBoundingClientRect();      }        /*          iterate over the store,          get each element and apply the right rotation angles.          Invert the view angle if set.      */      function followElements( e ){          [].forEach.call( store , function(item, index){              sPos = posOnScreen( item.element );              /* if the element is in the viewport */              if( sPos.top > -sPos.height || sPos.top < document.documentElement.clientHeight + sPos.height){                  invert = item.invert ? -1 : 1;                    xdeg = -90 * invert * ( e.clientX - sPos.left ) / document.documentElement.clientWidth + "deg";                  ydeg = 90 * invert * ( e.clientY - sPos.top ) / document.documentElement.clientHeight + "deg";                  prefixStyle(item.element,"transform","rotateY("+xdeg+") rotateX("+ydeg+")");              }else{              }          });      }        /* public methods */      /*      add an element to the store.      usage:          MouseFollower.add({              element: document.querySelector(".cube"),              invert: true          });      */      function add( opt ){          if( opt && opt.element ){              store.push( opt );          }      }      //TODO      function remove(arguments) {      }      function stop() {          store = [];      }        return {          add: add,          remove: remove,          stop: stop      }  })();

项目主页：http://www.open-open.com/lib/view/home/1390182824632