getQueryString

getQueryString.js

  function getQueryString(url, name) {
    var reg = new RegExp('(^|&)' + name + '=([^&]*)(&|$)', 'i');
    var index = url.indexOf('?');
    var r = url.substr(index).substr(1).match(reg);  //获取url中"?"符后的字符串并正则匹配
    var context = '';
    if (r != null)
      context = r[2];
    reg = null;
    r = null;
    return context == null || context == '' || context == 'undefined' ? '' : context;
  }