code: public static <T> WeightRandom<T> weightRandom(Iterable<WeightObj<T>> weightObjs) {
  		return new WeightRandom<>(weightObjs);
  	}
docs: 带有权重的随机生成器
  
  @param weightObjs 带有权重的对象列表
  @return {@link WeightRandom}
  @since 4.0.3