前端js判断访问站点设备是手机还是PC

   //判断登录设备
    var userAgentInfo = navigator.userAgent;
    var Agents = new Array("Android", "iPhone", "SymbianOS", "Windows Phone", "iPad", "iPod");
    var flag = false;
    var v = 0;
    for (v = 0; v < Agents.length; v++) {
        if (userAgentInfo.indexOf(Agents[v]) > 0) { flag = true; break; }
    }
   //点击登录按钮
    $('.login').on('click', function () {
        if (flag) {
            alert('当前是移动端')
         } else {
            alert('当前是PC')
        }
    })