解析URL参数为对象

function urlSearch(href) {
  let name, value;
  let str = href; //取得整个地址栏
  let num = str.indexOf("?");
  str = str.substr(num + 1); //取得所有参数
  let arr = str.split("&"); //各个参数放到数组里
  let json = {};
  for (let i = 0; i < arr.length; i++) {
    num = arr[i].indexOf("=");
    if (num > 0) {
      name = arr[i].substring(0, num);
      value = arr[i].substr(num + 1);
      json[name] = value;
    }
  }
  return json;
}