JavaScript 判断是否微信或QQ浏览器打开并跳转

$(window).on('load', function() {

  var winHeight = $(window).height();
  function is_weixin() {
    var ua = navigator.userAgent.toLowerCase();
    if (ua.match(/MicroMessenger/i) == 'micromessenger') {
      return true;
    } else {
      return false;
    }
  }
  function is_qq() {
    var ua = navigator.userAgent.toLowerCase();
    if (ua.indexOf('qq/') != -1) {
      return true;
    } else {
      return false;
    }
  }
  var isWeixin = is_weixin();
  var isQQ = is_qq();
  if(isWeixin || isQQ){
    location.href = url;
  }else{
    // do something else
  }
})