jQuery自定义拖拽插件

js代码：

;(function($){$.fn.extend({hjDrag(option){console.log(option)
const ele=option.titleSelector?this.find(option.titleSelector):this
this.css("position","absolute")
ele.on("mousedown",e=>{let disX=e.offsetX,disY=e.offsetY
$(document).on("mousemove",e=>{let _left=e.clientX-disX,_top=e.clientY-disY
if(_left<option.left){_left=option.left}
else if(_left>option.right){_left=option.right}
if(_top<option.up){_top=option.up}
else if(_top>option.down){_top=option.down}
this.css({left:_left,top:_top})})
$(document).on("mouseup",function(){$(this).off("mousemove")})
e.preventDefault()})}})})(jQuery)