需求：引入jquery实现根据图书编号查询对应图书
前台代码：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>jq框架Ajax相关API</title>
<script src="jquery.js"></script>
<script>
$(function(){
$("#btn").click(function(){
var code = $("#code").val();
$.ajax({
type:'get',
url:'04.php',
data:{code:code},
dataType:'json',
success:function(data){
if(data.flag == 0){
$("#box").text('没有该编号书籍');
}else{
var tag = '<ul><li>书名：'+ data.bookname +'</li><li>'+ data.author +'</li></ul>'
$("#box").html(tag);
}
},
error:function(){
$("#box").html("服务器端错误");
}
});
});
});
</script>
</head>
<body>
请输入图书编号：<input type="text" id="code" name="code">
<input type="button" value="查询" id="btn">
<div id="box"></div>
</body>
</html>
后台代码：
<?php
$code = $_GET['code'];
$arr = array();
$arr[1] = array("bookname"=>"西游记","author"=>"吴承恩");
$arr[2] = array("bookname"=>"三国演义","author"=>"罗贯中");
$arr[3] = array("bookname"=>"水浒传","author"=>"施耐庵");
$arr[4] = array("bookname"=>"红楼梦","author"=>"曹雪芹");
if(array_key_exists($code, $arr) == 1){//用来判断数组中是否有对应键
echo json_encode($arr[$code]);
}else {
echo '{"flag":"0"}';
}
?>
运行结果：
