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JS—我的第六个AJAX程序(前端从数据库中获取数据库中数据，JSON传输)

2017-10-31 19:28 746 查看

前端：

common.js

function $(id) {
return document.getElementById(id);
}

function createXhr(){
var xhr;
if(window.XMLHttpRequest){
xhr = new XMLHttpRequest();
}else{
xhr = new ActiveXObject("Microsoft XMLHttp");
}
return xhr;
}index.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
<script src="common.js"></script>
</head>
<body>
<button onclick="getMsg()">显示数据</button>
<script>
function getMsg(){
var xhr = createXhr();
xhr.open("get","users.php",true);
xhr.onreadystatechange = function() {
if(xhr.readyState == 4 && xhr.status == 200){
var resText = xhr.responseText;
var arr = JSON.parse(resText);
for(var i in arr){
console.log("编号:"+arr[i].uid);
console.log("用户姓名:"+arr[i].uname);
console.log("电子邮件:"+arr[i].email);
console.log("联系方式:"+arr[i].phone);
}
}
}
xhr.send(null);
}
</script>
</body>
</html>后台：
init.php

<?php

$conn = mysqli_connect("127.0.0.1","root","","xz",3306);
$initsql = "SET NAMES UTF8";
mysqli_query($conn,$initsql);
?>users.php
<?php

header("Content-Type:application/json");

require("init.php");

$sql = "SELECT * FROM xz_user";

$result = mysqli_query($conn,$sql);

if($result === false){
echo null;
}else{
$count = mysqli_affected_rows($conn);
if($count == 0){
echo 0;
}else{
$arr = mysqli_fetch_all($result,1);
$arr = json_encode($arr);
echo $arr;
}
}
?>

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