SOURCE

		var order = function(orderType,pay,stcok){
			if(orderType === 1){
				if(pay ===true){
					console.log('500元定金预购,得到100元优惠券')
				}else{
					if(stcok > 0){
						console.log('普通购买,无优惠券')
					}else{
						console.log('手机库存不足')
					}
				}
			}else if(orderType === 2){
				if(pay === true){
					console.log('200元定金预购,得到50元优惠券')
				}else{	
					if(stcok > 0){
						console.log('普通购买,无优惠券')
					}else{
						console.log('手机库存不足')
					}
				}
			}else if(orderType === 3){
				if(stcok > 0){
					console.log('普通购买,无优惠券')
				}else{
					console.log('手机库存不足')
				}
			}
		}
		order(2,false,0)