摘要：var filename = 'test.xlsx'; var xhr = new XMLHttpRequest(); xhr.open('POST', downloadExcel, true); xhr.setRequestHeader("Content-Type", "application/j 阅读全文

摘要：Lambda用到了JDK8自带的一个函数式接口Comparator<T>。 准备一个Apple类 public class Apple { private int weight; private String color; public Apple(){} public Apple(int weig 阅读全文