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      JavaScript 拖拽加动画效果

      拖拽加动画效果

      <!DOCTYPE html>
      <html>
      <head lang="en">
          <meta charset="UTF-8">
          <title>Duang!拖拽加效果</title>
          <style>
              body{-webkit-user-select: none;-moz-user-select: none;}
              #div1{width: 100px;height: 100px;background: orange;position: absolute;top: 0;left: 0;cursor: move;}
          </style>
      </head>
      <body>
      <div id="div1">拖拽效果</div>
      </body>
      </html>
      <script>
          var oDiv=document.getElementById("div1");
          oDiv.onmousedown=down;
      
      
      
          /*第一步*/
          function down(e){
              e=e||window.event;
              this.x=this.offsetLeft;
              this.y=this.offsetTop;
              this.mouseX=e.clientX;
              this.mouseY=e.clientY;
              if(this.setCapture){
                  //捕捉鼠标焦点的;IE的解决方法;
                  this.setCapture();
                  this.onmousemove=move;
                  this.onmouseup=up;
              }else{
                  var _move=bindThis(this,move);
                  var _up=bindThis(this,up);
                  document.onmousemove=_move;
                  document.onmouseup=_up;
              }
          };
          /*第二步*/
          function move(e){
              this.style.top=this.y+(e.clientY-this.mouseY)+"px";
              this.style.left=this.x+(e.clientX-this.mouseX)+"px";
              /*加动画效果的代码*/
              if(!this.prevX){
                  //记录第一次/上一次move事件触发的时候鼠标X轴位置;
                  this.prevX= e.clientX;
              }else{
                  this.speed= e.clientX-this.prevX;//速度=这次位置-上次位置;
                  this.prevX= e.clientX;//改变this.prevX;记录本次的位置
                  console.log(this.speed);
                  //两次move事件之间的事件间大体是一样的;
                  // 速度=单位时间的距离;
              }
              /*动画代码结束*/
          };
          /*第三步*/
          function up(e){
              /*IE解决鼠标丢失焦点*/
              if(this.releaseCapture){
                  this.releaseCapture();
                  this.onmousemove=null;
                  this.onmouseup=null;
              }else{
                  document.onmousemove=null;
                  document.onmouseup=null;
              }
              fly.call(this);
      
          };
          function fly(){
              //谁执行这个动画;this就是谁;
              this.speed*=0.93;
              this.style.left=this.offsetLeft+this.speed+"px";
              /*定时器的this是window;*/
              window.setTimeout(bindThis(this,arguments.callee),30)//arguments.callee就是函数本身的意思,也可以写fly;
          }
      
          function bindThis(obj,fn){
              //绑定this关键字
              return function(e){fn.call(obj,e)}
          }
      </script>
      

      拖拽加动画效果-过界判断

      <!DOCTYPE html>
      <html>
      <head lang="en">
          <meta charset="UTF-8">
          <title>Duang!拖拽加效果</title>
          <style>
              body{-webkit-user-select: none;-moz-user-select: none;}
              #div1{width: 100px;height: 100px;background: orange;position: absolute;top: 0;left: 0;cursor: move;}
          </style>
      </head>
      <body>
      <div id="div1">拖拽效果</div>
      </body>
      </html>
      <script>
          var oDiv=document.getElementById("div1");
          oDiv.onmousedown=down;
      
      
      
          /*第一步*/
          function down(e){
              e=e||window.event;
              this.x=this.offsetLeft;
              this.y=this.offsetTop;
              this.mouseX=e.clientX;
              this.mouseY=e.clientY;
              if(this.setCapture){
                  //捕捉鼠标焦点的;IE的解决方法;
                  this.setCapture();
                  this.onmousemove=move;
                  this.onmouseup=up;
              }else{
                  var _move=bindThis(this,move);
                  var _up=bindThis(this,up);
                  document.onmousemove=_move;
                  document.onmouseup=_up;
              }
          };
          /*第二步*/
          function move(e){
              this.style.top=this.y+(e.clientY-this.mouseY)+"px";
              this.style.left=this.x+(e.clientX-this.mouseX)+"px";
              /*加动画效果的代码*/
              if(!this.prevX){
                  //记录第一次/上一次move事件触发的时候鼠标X轴位置;
                  this.prevX= e.clientX;
              }else{
                  this.speed= e.clientX-this.prevX;//速度=这次位置-上次位置;
                  this.prevX= e.clientX;//改变this.prevX;记录本次的位置
                  console.log(this.speed);
                  //两次move事件之间的事件间大体是一样的;
                  // 速度=单位时间的距离;
              }
              /*动画代码结束*/
          };
          /*第三步*/
          function up(e){
              /*IE解决鼠标丢失焦点*/
              if(this.releaseCapture){
                  this.releaseCapture();
                  this.onmousemove=null;
                  this.onmouseup=null;
              }else{
                  document.onmousemove=null;
                  document.onmouseup=null;
              }
              fly.call(this);
      
          };
          function fly(){
              clearTimeout(this.flytimer);
              var maxRight=(document.documentElement.clientWidth||document.body.clientWidth)-this.offsetWidth;
              console.log("最大的右侧是"+maxRight);
              this.speed*=0.93;
              if(this.offsetLeft+this.speed>=maxRight){
                  this.style.left=maxRight+"px";
                  this.speed*=-1;
              }else if(this.offsetLeft+this.speed<=0){
                  this.style.left=0;
                  this.speed*=-1;
              }else{
                  this.style.left=this.offsetLeft+this.speed+"px";
              }
      
              this.flytimer=window.setTimeout(bindThis(this,arguments.callee),30);
          }
      
          function bindThis(obj,fn){
              //绑定this关键字
              return function(e){fn.call(obj,e)}
          }
      </script>
      

      拖拽加动画效果-自由落体

      <!DOCTYPE html>
      <html>
      <head lang="en">
          <meta charset="UTF-8">
          <title>Duang!拖拽加效果,再加自由落体</title>
          <style>
              body{-webkit-user-select: none;-moz-user-select: none;}
              #div1{width: 100px;height: 100px;background: orange;position: absolute;top: 0;left: 0;cursor: move;}
          </style>
      </head>
      <body>
      <div id="div1">拖拽效果</div>
      </body>
      </html>
      <script>
          var oDiv=document.getElementById("div1");
          oDiv.onmousedown=down;
      
          /*第一步*/
          function down(e){
              e=e||window.event;
              this.x=this.offsetLeft;
              this.y=this.offsetTop;
              this.mouseX=e.clientX;
              this.mouseY=e.clientY;
              if(this.setCapture){
                  //捕捉鼠标焦点的;IE的解决方法;
                  this.setCapture();
                  this.onmousemove=move;
                  this.onmouseup=up;
              }else{
                  var _move=bindThis(this,move);
                  var _up=bindThis(this,up);
                  document.onmousemove=_move;
                  document.onmouseup=_up;
              }
              clearTimeout(this.flytimer);
              clearTimeout(this.droptimer);
          };
          /*第二步*/
          function move(e){
              this.style.top=this.y+(e.clientY-this.mouseY)+"px";
              this.style.left=this.x+(e.clientX-this.mouseX)+"px";
              /*加动画效果的代码*/
              if(!this.prevX){
                  //记录第一次/上一次move事件触发的时候鼠标X轴位置;
                  this.prevX= e.clientX;
              }else{
                  this.speed= e.clientX-this.prevX;//速度=这次位置-上次位置;
                  this.prevX= e.clientX;//改变this.prevX;记录本次的位置
                  //两次move事件之间的事件间大体是一样的;
                  // 速度=单位时间的距离;
              }
              /*动画代码结束*/
          };
          /*第三步*/
          function up(e){
              /*IE解决鼠标丢失焦点*/
              if(this.releaseCapture){
                  this.releaseCapture();
                  this.onmousemove=null;
                  this.onmouseup=null;
              }else{
                  document.onmousemove=null;
                  document.onmouseup=null;
              }
      //        fly.call(this);
      //        drop.call(this);
      
          };
      
          /*左右反弹*/
          function fly(){
              clearTimeout(this.flytimer);
              var maxRight=(document.documentElement.clientWidth||document.body.clientWidth)-this.offsetWidth;
              this.speed*=0.93;
              if(this.offsetLeft+this.speed>=maxRight){
                  this.style.left=maxRight+"px";
                  this.speed*=-1;
              }else if(this.offsetLeft+this.speed<=0){
                  this.style.left=0;
                  this.speed*=-1;
              }else{
                  this.style.left=this.offsetLeft+this.speed+"px";
              }
              if(Math.abs(this.speed)>=0.5){/*定时器停止的条件*/
                  this.flytimer=window.setTimeout(bindThis(this,arguments.callee),30);
              }
          }
      
          /*自由落体*/
          var g=9.8;
          var flag=0;
          function drop(){
              clearTimeout(this.droptimer);
              var maxBottom=(document.documentElement.clientHeight||document.body.clientHeight)-this.offsetHeight;
              if(!this.dropSpeed){
                  this.dropSpeed=g;
              }else{
                  this.dropSpeed+=g;
              }
              /*下面是摩擦系数*/
              this.dropSpeed*=0.93;
              /*下面是边界判断*/
              if(this.offsetTop+this.dropSpeed>=maxBottom){
                  this.style.top=maxBottom+"px";
                  this.dropSpeed*=-1;
                  flag++;
              }else{
                  this.style.top=this.offsetTop+this.dropSpeed+"px";
                  flag=0;
              }
              if(flag<2){
                  this.droptimer=window.setTimeout(bindThis(this,arguments.callee),30);
              }
          }
      
          function bindThis(obj,fn){
              return function(e){fn.call(obj,e)}
          }
      </script>
      
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