js判断页面是从pc，ipad，phone 打开的

    function IsPC() {
        var userAgentInfo = navigator.userAgent;
        var Agents = [
            "Android",
            "iPhone",
            "SymbianOS",
            "Windows Phone",
            "iPad",
            "iPod"
        ];

        for (var v = 0; v < Agents.length; v++) {

            if (userAgentInfo.indexOf(Agents[v]) > 0) {

                return Agents[v];
            }else{
                return "pc";
            }

        }
    };
    var shebei = IsPC();
    console.log(shebei)