JS判断是PC端还是手机端

JS中判断当前环境是PC端还是手机端,以确定点击事件用哪个方法;

//事件的名称
    var clickOrT = '';  
    var system ={    
        win : false,    
        mac : false,    
        xll : 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);    
    //跳转语句     
    if(system.win||system.mac||system.xll){
    	clickOrT = 'click';
    }else{    
    	clickOrT = 'touchend';
    }

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