Javascript 在表格中拖动系统

我已经创建了这个表。我想设置一个变量Winner（即它是黑色或红色）。如果是B，哪个变量将拖动P1B.png。如果是R，它将拖动P2R.png。这是我的桌子（我试图拖动，但没有成功。我使用w3school（）

首先，我想能够拖动它们。第二，如果可能的话，我想做一个系统拖动（因为我会在那之后做）。如果一个变量（variable winner让我们称它为==到B，那么我想能够只拖动P1B.png），如果variable it==仅拖动P2R.png）。我尝试了很多次，但失败了，所以我的一次尝试就是这样

<p id="demo"></p>

<script>
var winner;
switch (winner == B || winner == R ) {
  case 0:
   winner = ;
    break;
  case 1:
    winner = ";
    break;
  
  case  2:
    winner = "something went wrong";
}
document.getElementById("demo").innerHTML = "Player is playing now " + winner;
</script>

var赢家；
开关（winner==B | | winner==R）{
案例0：
获胜者=；
打破
案例1：
winner=“；
打破
案例2：
winner=“出了问题”；
}
document.getElementById（“demo”）.innerHTML=“玩家正在玩”+赢家；

  //Make the DIV element draggagle:
dragElement(document.getElementById("dragme"));

function dragElement(elmnt) {
  var pos1 = 0, pos2 = 0, pos3 = 0, pos4 = 0;
  if (document.getElementById(elmnt.id + "header")) {
    /* if present, the header is where you move the DIV from:*/
    document.getElementById(elmnt.id + "header").onmousedown = dragMouseDown;
  } else {
    /* otherwise, move the DIV from anywhere inside the DIV:*/
    elmnt.onmousedown = dragMouseDown;
  }

  function dragMouseDown(e) {
    e = e || window.event;
    e.preventDefault();
    // get the mouse cursor position at startup:
    pos3 = e.clientX;
    pos4 = e.clientY;
    document.onmouseup = closeDragElement;
    // call a function whenever the cursor moves:
    document.onmousemove = elementDrag;
  }

  function elementDrag(e) {
    e = e || window.event;
    e.preventDefault();
    // calculate the new cursor position:
    pos1 = pos3 - e.clientX;
    pos2 = pos4 - e.clientY;
    pos3 = e.clientX;
    pos4 = e.clientY;
    // set the element's new position:
    elmnt.style.top = (elmnt.offsetTop - pos2) + "px";
    elmnt.style.left = (elmnt.offsetLeft - pos1) + "px";
  }

  function closeDragElement() {
    /* stop moving when mouse button is released:*/
    document.onmouseup = null;
    document.onmousemove = null;
  }
}
  
  
  
  

<p id="demo"></p>

<script>
var winner;
switch (winner == B || winner == R ) {
  case 0:
   winner = ;
    break;
  case 1:
    winner = ";
    break;
  
  case  2:
    winner = "something went wrong";
}
document.getElementById("demo").innerHTML = "Player is playing now " + winner;
</script>