判断是手机还是PC端访问

/*判断手机*/
//判断是手机浏览还是pc
//平台、设备和操作系统
var system = {
win: false,
mac: false,
xll: false,
ipad: false
};
//检测平台
var p = navigator.platform;
system.win = p.indexOf("Win") == 0;
system.mac = p.indexOf("Mac") == 0;
system.x11 = (p == "X11") || (p.indexOf("Linux") == 0);
system.ipad = (navigator.userAgent.match(/iPad/i) != null) ? true : false; 

if (system.win || system.mac || system.xll || system.ipad) { 

} else { 

var ua = navigator.userAgent.toLowerCase();
if(ua.match(/MicroMessenger/i)=="micromessenger") {
//微信中显示
$("#vedioCon").css("height","320px");
} else { 

var ua = navigator.userAgent.toLowerCase();
if(ua.match(/MicroMessenger/i)=="micromessenger") {
//微信中显示
$("#vedioCon").css("height","320px");
} else {
// 手机浏览器
$("#vedioCon").css("height","320px");
}
}
}