jq判断是PC还是手机端的方法

$(function(){
		//判断是否是手机
		var mobile_flag = isMobile();
		if(mobile_flag){
				$('.now_qq').attr('href',"mqqwpa://im/chat?chat_type=wpa&uin=<?php echo $qq['qq']?>&version=1&src_type=web&web_src=lvlingseeds.com");
		}else{
				$('.now_qq').attr('href',"tencent://message/?Site=baidu.com&uin=<?php echo $qq['qq']?>&Menu=yes");
		}
	})

function isMobile() {
		    var userAgentInfo = navigator.userAgent;

		    var mobileAgents = [ "Android", "iPhone", "SymbianOS", "Windows Phone", "iPad","iPod"];

		    var mobile_flag = false;

		    //根据userAgent判断是否是手机
		    for (var v = 0; v < mobileAgents.length; v++) {
		        if (userAgentInfo.indexOf(mobileAgents[v]) > 0) {
		            mobile_flag = true;
		            break;
		        }
		    }
		     var screen_width = window.screen.width;
		     var screen_height = window.screen.height;    

		     //根据屏幕分辨率判断是否是手机
		     if(screen_width < 500 && screen_height < 800){
		         mobile_flag = true;
		     }

		     return mobile_flag;
		}