获取url参数

function getQueryObject(url) {
  url = url == null ? window.location.href : url;
  var search = url.substring(url.lastIndexOf("?") + 1);
  var obj = {};
  var reg = /([^?&=]+)=([^?&=]*)/g;
  search.replace(reg, function (rs, $1, $2) {
    var name = decodeURIComponent($1);
    var val = decodeURIComponent($2);
    val = String(val);
    obj[name] = val;
    return rs;
  });
  return obj;
}