jQuery customizes the box and gets the data in the box

<script type="text/javascript">
 //鼠标按下时的X Y坐标
 varmouseDownX;
 varmouseDownY;
 //鼠标按下时移动的X Y 坐标
 varmouseMoveX;
 varmouseMoveY;
 //移动的状态
 varisMove =false;
 /*初始化 选择框 */
 functioninit() {
  $("#selected").css("display","none");
  $("#selected").css("top","0");
  $("#selected").css("left","0");
  $("#selected").css("width","0");
  $("#selected").css("height","0");
 }
 $(document).ready(function() {
  init();
  varselectedTD =newArray();//创建被选中表格数组
  varTD = $("td");//获取所有表格信息
  for(vari = 0; i < TD.length; i++) {
   selectedTD.push(TD[i]);
  }
  $("#tablep").mousedown(function(event) {
   mouseDownX = event.clientX - $(this).offset().left;;
   mouseDownY = event.clientY - $(this).offset().top;
   console.log("mouseDownX="+ mouseDownX +" mouseDownY="+ mouseDownY );
   if(event.target.id.match(/selected/)) {
    isMove =true;
   }
   //鼠标按下并移动时进行判断（拖拽 or 画框）
   $("#tablep").mousemove(function(event) {
    mouseMoveX = event.clientX - $(this).offset().left;
    mouseMoveY = event.clientY - $(this).offset().top;
    varselectp = document.getElementById("selected");
    if(isMove) {
     //拖拽的代码，因为实在不想算 xy 了，所以使用了jquery ui
     $("#selected").draggable();
     //这部分是负责画框的时候，实时把框住的表格变色的，（代码和下面的代码重复了）
     varleft = selectp.offsetLeft, top = selectp.offsetTop; width = selectp.offsetWidth, height = selectp.offsetHeight;
     for(vari = 0; i < selectedTD.length; i++) {
      varsl = selectedTD[i].offsetWidth + selectedTD[i].offsetLeft;
      varst = selectedTD[i].offsetHeight + selectedTD[i].offsetTop;
      if(sl > left && st > top && selectedTD[i].offsetLeft < left + width && selectedTD[i].offsetTop < top + height) {
       if(selectedTD[i].className.indexOf("selected") == -1) {
        selectedTD[i].className ="selected";
       }
      }else{
       if(selectedTD[i].className.indexOf("selected") != -1) {
        selectedTD[i].className ="TD";
       }
      }
     }
    }else{
     //重复的代码，完了再把它抽取出来
     varleft = selectp.offsetLeft, top = selectp.offsetTop; width = selectp.offsetWidth, height = selectp.offsetHeight;
     for(vari = 0; i < selectedTD.length; i++) {
      varsl = selectedTD[i].offsetWidth + selectedTD[i].offsetLeft;
      varst = selectedTD[i].offsetHeight + selectedTD[i].offsetTop;
      if(sl > left && st > top && selectedTD[i].offsetLeft < left + width && selectedTD[i].offsetTop < top + height) {
       if(selectedTD[i].className.indexOf("selected") == -1) {
        selectedTD[i].className ="selected";
       }
      }else{
       if(selectedTD[i].className.indexOf("selected") != -1) {
        selectedTD[i].className ="TD";
       }
      }
     }
     //鼠标抬起结束画框，和拖动
     $("#tablep").mouseup(function() {
      console.log("mouseUpX="+ mouseMoveX +" mouseUpY="+ mouseMoveX);
      isMove =false;
      $(this).unbind('mousemove');
     })
     //画框
     displaySelected(mouseDownY, mouseDownX, mouseMoveX, mouseMoveY);
    }
   })
  })
  //当鼠标在已经画好的框上时，改变鼠标指针样式，就是十字形了
  $("#selected").mouseenter(function() {
   $("#selected").css("cursor","move");
  });
 });
 functiondisplaySelected(mouseDownY, mouseDownX, mouseUpX, mouseUpY) {
  $("#selected").css("display","block");
  $("#selected").css("top", mouseDownY);
  $("#selected").css("left", mouseDownX);
  varmoveX = mouseMoveX - mouseDownX;
  varmoveY = mouseMoveY - mouseDownY;
  if(moveY < 0) {
    $("#selected").css("top", event.clientY - $("#table").offset().top);
  }
  if(moveX < 0) {
   $("#selected").css("left", event.clientX - $("#table").offset().left);
  }
  $("#selected").css("width", Math.abs(moveX));
  $("#selected").css("height", Math.abs(moveY));
 }
 </script>

<p id="tablep"style="width: 1500px; height: 1500px;top: 100px; left:100px; position: absolute;">
  <p id="selected"style="border:5px dotted rgb(239, 37, 17);position: absolute;display: none;"></p>
  <table border="1"style=" width: 1500px; height: 1500px;"id="table">
  <tr>
   <td id="1"class="TD"></td>
   <td id="2"class="TD"></td>
   <td id="3"class="TD"></td>
   <td id="4"class="TD"></td>
   <td id="5"class="TD"></td>
   <td id="6"class="TD"></td>
  </tr>
  <tr>
   <td id="7"class="TD"></td>
   <td id="8"class="TD"></td>
   <td id="9"class="TD"></td>
   <td id="10"class="TD"></td>
   <td id="11"class="TD"></td>
   <td id="12"class="TD"></td>
  </tr>
  <tr>
   <td id="1"class="TD"></td>
   <td id="2"class="TD"></td>
   <td id="3"class="TD"></td>
   <td id="4"class="TD"></td>
   <td id="5"class="TD"></td>
   <td id="6"class="TD"></td>
  </tr>
  </table>
 <!--表格代码太多所以...-->
 </p>