text: export const queryParams =  (searchString) => {
      let query = {};
      const reg = new RegExp(/([^=&]+)=([^&]+)/g);
      searchString.replace(reg,function (full,key,value) {
          if(query[key] === undefined){
              query[key] = value;
          }else{
              if(Object.prototype.toString.call(query[key]) === '[object Array]'){
                  query[key].push(value);
              }else{
                  query[key] = [query[key],value];
              }
          }
      });
      return query;
  };
  
  export function debounce(func, wait, immediate) {
      let timeout, args, context, timestamp, result
  
      const later = function() {
          // 据上一次触发时间间隔
          const last = +new Date() - timestamp
  
          // 上次被包装函数被调用时间间隔 last 小于设定时间间隔 wait
          if (last < wait && last > 0) {
              timeout = setTimeout(later, wait - last)
          } else {
              timeout = null
              // 如果设定为immediate===true，因为开始边界已经调用过了此处无需调用
              if (!immediate) {
                  result = func.apply(context, args)
                  if (!timeout) context = args = null
              }
          }
      }
  
      return function(...args) {
          context = this
          timestamp = +new Date()
          const callNow = immediate && !timeout
          // 如果延时不存在，重新设定延时
          if (!timeout) timeout = setTimeout(later, wait)
          if (callNow) {
              result = func.apply(context, args)
              context = args = null
          }
  
          return result
      }
  }
  