基于JQuery 改造bootstrap模态框拖动功能

看不爽现有的bootstrap拖动实现，自己也手痒，就自己写了一个拖动处理。

PS：其他实现拖动方法 http://www.gbtags.com/gb/rtreplayerpreview/230.htm 供参考

JQuery版本1.7.2

Bootstrap版本3.3.4

html代码（就是普通的模态框代码）

    

    	

			

	    		

	    			
	                  ×
	            	
	    		 

		           关闭
		            
			
			
    	
    
			

Js代码

/** 拖拽模态框*/
		var mouseStartPoint = {"left":0,"top":  0};
		var mouseEndPoint = {"left":0,"top":  0};
		var mouseDragDown = false;
		var oldP = {"left":0,"top":  0};
		var moveTartet ;
		$(document).ready(function(){
			$(document).on("mousedown",".modal-header",function(e){
				if($(e.target).hasClass("close"))//点关闭按钮不能移动对话框
					return;
				mouseDragDown = true;
				moveTartet = $(this).parent();
				mouseStartPoint = {"left":e.clientX,"top":  e.clientY};
				oldP = moveTartet.offset();
			});
			$(document).on("mouseup",function(e){
				mouseDragDown = false;
				moveTartet = undefined;
				mouseStartPoint = {"left":0,"top":  0};
				oldP = {"left":0,"top":  0};
			});
			$(document).on("mousemove",function(e){
				if(!mouseDragDown || moveTartet == undefined)return;
				var mousX = e.clientX;
				var mousY = e.clientY;
				if(mousX < 0)mousX = 0;
				if(mousY < 0)mousY = 25;
				mouseEndPoint = {"left":mousX,"top": mousY};
				var width = moveTartet.width();
				var height = moveTartet.height();
				mouseEndPoint.left = mouseEndPoint.left - (mouseStartPoint.left - oldP.left);//移动修正，更平滑
				mouseEndPoint.top = mouseEndPoint.top - (mouseStartPoint.top - oldP.top);
				moveTartet.offset(mouseEndPoint);
			});
		});

原理：

并没有什么鬼原理，就是简单的数学计算。