页面就绪函数必须要使用吗?我的代码没使用好像效果也出来了,老师帮忙给看下有没有问题
来源:3-6 自由编程
Adopat
2019-07-28 15:17:07
package com.imooc.ajax.practice;
public class Music {
private String popName;
private String classicName;
private String rockName;
public Music() {
}
public Music(String popName, String classicName, String rockName) {
super();
this.popName = popName;
this.classicName = classicName;
this.rockName = rockName;
}
public String getPopName() {
return popName;
}
public void setPopName(String popName) {
this.popName = popName;
}
public String getClassicName() {
return classicName;
}
public void setClassicName(String classicName) {
this.classicName = classicName;
}
public String getRockName() {
return rockName;
}
public void setRockName(String rockName) {
this.rockName = rockName;
}
}
package com.imooc.ajax.practice;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import com.alibaba.fastjson.JSON;
/**
* Servlet implementation class MusicServlet
*/
@WebServlet("/music_list")
public class MusicServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
/**
* @see HttpServlet#HttpServlet()
*/
public MusicServlet() {
super();
// TODO Auto-generated constructor stub
}
/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
List list = new ArrayList();
list.add(new Music("稻香","千千阙歌","一块红布"));
list.add(new Music("晴天","傻女","假行僧"));
list.add(new Music("告白气球","七友","新长征路上的摇滚"));
String json = JSON.toJSONString(list);
System.out.println(json);
response.setContentType("text/html;charset=UTF-8");
response.getWriter().println(json);
}
}
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
<div>
<input id="btnLoad" type="button" value="流行歌曲" /><input id="btnLoad1" type="button" value="经典歌曲" /><input id="btnLoad2" type="button" value="摇滚歌曲" />
<div id="container"></div>
</div>
<script type="text/javascript" src="js/jquery-3.4.1.js"></script>
<script type="text/javascript">
$("#btnLoad").click(function(){
$.ajax({
"url" : "/ajax/music_list",
"type" : "get",
"dataType" : "json",
"success" : function(json){
console.log(json);
$("#container>h1").remove();
for(var i=0;i<json.length;i++){
$("#container").append("<h1>"+json[i].popName+"</h1>");
}
},
"error" : function(xmlhttp ,errorText){
console.log(xmlhttp);
console.log(errorText);
if(xmlhttp.status =="405"){
alert("无效的请求方式");
}else if(xmlhttp.status =="400"){
alert("未找到URL资源");
}else if(xmlhttp.status =="500"){
alert("服务器内部错误,请联系管理员");
}else{
alert("产生异常,请联系管理员");
}
}
})
})
$("#btnLoad1").click(function(){
$.ajax({
"url" : "/ajax/music_list",
"type" : "get",
"dataType" : "json",
"success" : function(json){
console.log(json);
$("#container>h1").remove();
for(var i=0;i<json.length;i++){
$("#container").append("<h1>"+json[i].classicName+"</h1>");
}
},
"error" : function(xmlhttp ,errorText){
console.log(xmlhttp);
console.log(errorText);
if(xmlhttp.status =="405"){
alert("无效的请求方式");
}else if(xmlhttp.status =="400"){
alert("未找到URL资源");
}else if(xmlhttp.status =="500"){
alert("服务器内部错误,请联系管理员");
}else{
alert("产生异常,请联系管理员");
}
}
})
})
$("#btnLoad2").click(function(){
$.ajax({
"url" : "/ajax/music_list",
"type" : "get",
"dataType" : "json",
"success" : function(json){
console.log(json);
$("#container>h1").remove();
for(var i=0;i<json.length;i++){
$("#container").append("<h1>"+json[i].rockName+"</h1>");
}
},
"error" : function(xmlhttp ,errorText){
console.log(xmlhttp);
console.log(errorText);
if(xmlhttp.status =="405"){
alert("无效的请求方式");
}else if(xmlhttp.status =="400"){
alert("未找到URL资源");
}else if(xmlhttp.status =="500"){
alert("服务器内部错误,请联系管理员");
}else{
alert("产生异常,请联系管理员");
}
}
})
})
</script>
</body>
</html>1回答
好帮手慕柯南
2019-07-28
同学你好!代码没有问题呢,功能完成的不错。页面就绪函数,如果没有初始化操作,不需要呢。
如果我的回答解决了你的疑惑,请采纳,祝学习愉快~
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