在IE和FF/Chrome中动态构造查询字符串行为

function buildQueryString(params) {
  var queryString = "";
  for (var key in params) {
    if (params.hasOwnProperty(key)) {
      var value = params[key];
      if (queryString.length > 0) {
        queryString += "&";
      }
      queryString += encodeURIComponent(key) + "=" + encodeURIComponent(value);
    }
  }
  return queryString;
}

// 使用示例
var params = {
  name: "John",
  age: 30,
  city: "New York"
};
var queryString = buildQueryString(params);
console.log(queryString); // 输出：name=John&age=30&city=New%20York