var move = false; //移动标记 
var _x;
var _width = $('.dragX').width();
$(".drag-handle").mousedown(function(e) {
	move = true;
	_x = e.pageX - parseInt($(".drag-handle").css("left"));
});
$(document).mousemove(function(e) {
	if(move) {
		var x = e.pageX - _x;
		if(x <=0) {x = 0}
		if(x >= _width) {x = _width}
		$(".drag-handle").css({"left": x});
	
	}
	
})
$(document).mouseup(function() {
	move = false;
});