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/**
 * 获取get参数
 * @param {String} str
 * @param {String} variable
 */
function getQueryVariable(str, variable) {
  var vars = str.split("&");
  for (var i = 0; i < vars.length; i++) {
    var pair = vars[i].split("=");
    if (pair[0] == variable) {
      return pair[1];
    }
  }
  return false;
}

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调用: getQueryVariable(window.location.search.substring(1), "key");
返回: "pal";

调用: getQueryVariable(window.location.search.substring(1), "key2");
返回: "run";