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four.html

<!doctype html>
<html lang="en">
<meta charset="UTF-8">
<head>
<meta charset="UTF-8">
<title>拖拽</title>
<script src="/extensions/bootstrap/js/jquery.js"></script>
<style>
*{
  padding: 0;
  margin: 0;
}

div{
  width: 100px;
  height: 100px;
  background: #f00;
  cursor: pointer;
  position: absolute;
  left: 0;
  top: 0;
}
.biaoti{
width:500px;
left:300px;
background:#FFF;
}
</style>
</head>
<body>

<div class="biaoti"><h1>第四关：拖动练习 </h1></div>
<hr>
<div id="diva">拖动此物体</div>

<script>
/*
*制作人：般若波罗蜜  QQ:27708647 2022.09
*/
$(function(){
  //移动窗口的步骤
  //1、按下鼠标左键
  //2、移动鼠标
  $('#diva').mousedown(function(e){

  if(e.which==3){
   //alert("鼠标右键触发事件");
   return;}
  if(e.which==2){
   //alert("鼠标2事件");
   }


    // e.pageX
    var positionDiv = $(this).offset();
    var distenceX = e.pageX - positionDiv.left;
    var distenceY = e.pageY - positionDiv.top;
    //alert(distenceX)
    // alert(positionDiv.left);
    $(document).mousemove(function(e){
      var x = e.pageX - distenceX;
      var y = e.pageY - distenceY;
      if(x<0){
        x=0;
      }else if(x>$(document).width()-$('div').outerWidth(true)){
        x = $(document).width()-$('div').outerWidth(true);
      }
      if(y<0){
        y=0;
      }else if(y>$(document).height()-$('div').outerHeight(true)){
        y = $(document).height()-$('div').outerHeight(true);
      }
	  if((x>=290 && x<=310) && (y>=290 && y<=310)){$("#mubiao").html("成功！");location.href="/blog";}else{$("#mubiao").html("目标");}
      $('#diva').css({
        'left':x+'px',
        'top':y+'px'
      });
    });
    $(document).mouseup(function(){
      $(document).off('mousemove');
    });
  });
});
//屏蔽自带右键菜单
document.oncontextmenu = function(e){
         return false;
}
</script>
<div style="left:300px;top:300px; font-size:20px;" id='mubiao' >目标</div>


</body>
</html>