jQuery-UI draggable在移动端浏览器不起作用解决方案

遇到jQuery-UI draggable微软平板Surface浏览器下不起作用，可用此方法解决。

// 扩展jQuery-UI功能，draggable在移动端浏览器不起作用解决方案，同时支持点击
// This is a fix for mobile devices
var moveFlag = 0;
// 判断是不是iPad|iPhone|Android，判断是不是微软平板Surface
(/iPad|iPhone|Android/.test(navigator.userAgent) || window.matchMedia('(pointer: coarse)').matches) && (function( $ ) {
	var proto =  $.ui.mouse.prototype,
	_mouseInit = proto._mouseInit;
	$.extend( proto, {
	    _mouseInit: function() {
	        this.element
	        .bind( "touchstart." + this.widgetName, $.proxy( this, "_touchStart" ) );
	        _mouseInit.apply( this, arguments );
	    },
	    _touchStart: function( event ) {
	         this.element
	        .bind( "touchmove." + this.widgetName, $.proxy( this, "_touchMove" ) )
	        .bind( "touchend." + this.widgetName, $.proxy( this, "_touchEnd" ) );

	        this._modifyEvent( event );

	        $( document ).trigger($.Event("mouseup")); //reset mouseHandled flag in ui.mouse
	        this._mouseDown( event );

	        //return false;           
	    },
	    _touchMove: function( event ) {
	    	moveFlag = 1;
	        this._modifyEvent( event );
	        this._mouseMove( event );   

	    },
	    _touchEnd: function( event ) {
	        // dispatch the click event
	        if (moveFlag == 0) {
	        	var evt = document.createEvent('Event'); 
		        evt.initEvent('click',true,true); 
                // this.handleElement[0].dispatchEvent(evt);
                event.target.dispatchEvent(evt);
	        };
	        
	        this.element
	        .unbind( "touchmove." + this.widgetName )
	        .unbind( "touchend." + this.widgetName );
	        this._mouseUp( event ); 

	    	moveFlag = 0;
	    },
	    _modifyEvent: function( event ) {
	        event.which = 1;
	        var target = event.originalEvent.targetTouches[0];
	        event.pageX = target.clientX;
	        event.pageY = target.clientY;
	    }
	});
})( jQuery );