用Json实现PHP与JavaScript间数据交换
JSON(JavaScript Object Notation) 是一种轻量级的数据交换格式。
简而论之，不管是xml还是json都是为了方便在客户端与服务器端交互数据的中转站，特别是用于对象型数据，比如最常见的数组。
下面将分别将数组从php传送给javascript，以及将数组从javascript传送给php示例说明，例子比较简单，明白概念即可。不管从php传送给javascript，还是javascript传送给php，json在传送之前都会将对象扁平化即一维化为字符串。
PHP 向 JavaScript 传值
PHP 文件 json.php
<?php $arr = array( 'name' => '希亚', 'nick' => 'Gonn', 'contact' => array( 'email' => 'gonnsai@163.com', 'website' => 'http://www.bkjia.com', ) ); $json_string = json_encode($arr); echo "getProfile($json_string)"; ?>
光执行这个文件，其结果如下：
getProfile({"name":"u5e0cu4e9a","nick":"Gonn",
"contact":{"email":"gonnsai@163.com","website":"http://www.bkjia.com"}})
json.php 是通过 json_encode 函数将数组扁平化，然后发送，相反有个 json_decode 函数。
那么在 JavaScript 如何调用呢？很简单，定义一个变量获取 PHP 传来的 Json，该 Json 具备对象的特性，我们可以用 array.name 这种方式来获取该 Json 的属性。
<script type="text/javascript">
function getProfile(str) {
var arr = str;
document.getElementById('name').innerHTML = arr.name;
document.getElementById('nick').innerHTML = arr.nick;
document.getElementById('email').innerHTML = arr.contact.email;
document.getElementById('website').innerHTML = arr.contact.website;
}
</script>
<body>
<div id="name"></div>
<div id="nick"></div>
<div id="email"></div>
<div id="website"></div>
</body>
<script type="text/javascript" src="json.php"></script>
运行结果如下：
希亚 Gonn gonnsai@163.com http://www.bkjia.com
JavaScript 向 PHP 传值
json_encode.html
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>json:From javascript To php</title>
<script src="json2.js" type="text/javascript"></script>
<script type="text/javascript">
function JSON_test(o)
{
var user = {
name:document.getElementById('txt_name').value,
email:document.getElementById('txt_email').value,
password:document.getElementById('txt_password').value
}
var json_string = JSON.stringify(user);
document.getElementById('txt_json').value=json_string;
alert("点击确定后将提交表单");
o.submit();
}
</script>
</head>
<body>
<form id="form1" name="form1" method="post" action="json_encode.php" onsubmit="JSON_test(this);return flase;">
<label for="txt_name">姓名</label>
<p><input type="text" name="txt_name" id="txt_name" /></p>
<label for="txt_email">邮箱</label>
<p><input type="text" name="txt_email" id="txt_email" /></p>
<p><label for="txt_password">密码</label></p>
<p><input type="text" name="txt_password" id="txt_password" /></p>
<p><input type="text" name="txt_json" id="txt_json" />
<label for="button"></label>
<input type="submit" name="button" id="button" value="JSON" />
</p>
</form>
</body>
</html>
这里javascript扁平化需要一个插件：http://www.json.org/json2.js，通过JSON.stringify(str)将对象扁平化然后传送给php。
注：另有一个http://www.json.org/json.js，对应的是toJSONString方法。
var last=obj.toJSONString(); //针对json.js var last=JSON.stringify(obj); //针对json2.js
json_encode.php
<?php
header('Content-Type: text/html; charset=utf-8');
$json_string = $_POST["txt_json"];
//echo $json_string;
if(ini_get("magic_quotes_gpc")=="1")
{
$json_string=stripslashes($json_string);
}
$user = json_decode($json_string);
echo var_dump($user);
echo '<br /><br /><br /><br />';
echo $user->name.'<br />';
echo $user->email.'<br />';
echo $user->password.'<br />';
?>
这里就需要用到json_decode()这个函数，然后调用其中数据用 $obj->属性即可。
Hot AI Tools
Undresser.AI Undress
AI-powered app for creating realistic nude photos
AI Clothes Remover
Online AI tool for removing clothes from photos.
Undress AI Tool
Undress images for free
Clothoff.io
AI clothes remover
AI Hentai Generator
Generate AI Hentai for free.
Hot Article
Hot Tools
Notepad++7.3.1
Easy-to-use and free code editor
SublimeText3 Chinese version
Chinese version, very easy to use
Zend Studio 13.0.1
Powerful PHP integrated development environment
Dreamweaver CS6
Visual web development tools
SublimeText3 Mac version
God-level code editing software (SublimeText3)
Hot Topics
1382
52
Combination of golang WebSocket and JSON: realizing data transmission and parsing
Dec 17, 2023 pm 03:06 PM
The combination of golangWebSocket and JSON: realizing data transmission and parsing In modern Web development, real-time data transmission is becoming more and more important. WebSocket is a protocol used to achieve two-way communication. Unlike the traditional HTTP request-response model, WebSocket allows the server to actively push data to the client. JSON (JavaScriptObjectNotation) is a lightweight format for data exchange that is concise and easy to read.
How to exclude a field from JSON using @Expose annotation in Java?
Sep 16, 2023 pm 09:49 PM
The Gson@Expose annotation can be used to mark whether a field is exposed (contained or not) for serialization or deserialization. The @Expose annotation can take two parameters, each parameter is a boolean value and can take the value true or false. In order for GSON to react to the @Expose annotation, we have to create a Gson instance using the GsonBuilder class and need to call the excludeFieldsWithoutExposeAnnotation() method, which configures Gson to exclude all fields without Expose annotation from serialization or deserialization. Syntax publicGsonBuilderexclud
What is the difference between MySQL5.7 and MySQL8.0?
Feb 19, 2024 am 11:21 AM
MySQL5.7 and MySQL8.0 are two different MySQL database versions. There are some main differences between them: Performance improvements: MySQL8.0 has some performance improvements compared to MySQL5.7. These include better query optimizers, more efficient query execution plan generation, better indexing algorithms and parallel queries, etc. These improvements can improve query performance and overall system performance. JSON support: MySQL 8.0 introduces native support for JSON data type, including storage, query and indexing of JSON data. This makes processing and manipulating JSON data in MySQL more convenient and efficient. Transaction features: MySQL8.0 introduces some new transaction features, such as atomic
Performance optimization tips for converting PHP arrays to JSON
May 04, 2024 pm 06:15 PM
Performance optimization methods for converting PHP arrays to JSON include: using JSON extensions and the json_encode() function; adding the JSON_UNESCAPED_UNICODE option to avoid character escaping; using buffers to improve loop encoding performance; caching JSON encoding results; and considering using a third-party JSON encoding library.
How to handle XML and JSON data formats in C# development
Oct 09, 2023 pm 06:15 PM
How to handle XML and JSON data formats in C# development requires specific code examples. In modern software development, XML and JSON are two widely used data formats. XML (Extensible Markup Language) is a markup language used to store and transmit data, while JSON (JavaScript Object Notation) is a lightweight data exchange format. In C# development, we often need to process and operate XML and JSON data. This article will focus on how to use C# to process these two data formats, and attach
Use the json.MarshalIndent function in golang to convert the structure into a formatted JSON string
Nov 18, 2023 pm 01:59 PM
Use the json.MarshalIndent function in golang to convert the structure into a formatted JSON string. When writing programs in Golang, we often need to convert the structure into a JSON string. In this process, the json.MarshalIndent function can help us. Implement formatted output. Below we will explain in detail how to use this function and provide specific code examples. First, let's create a structure containing some data. The following is an indication
Pandas usage tutorial: Quick start for reading JSON files
Jan 13, 2024 am 10:15 AM
Quick Start: Pandas method of reading JSON files, specific code examples are required Introduction: In the field of data analysis and data science, Pandas is one of the important Python libraries. It provides rich functions and flexible data structures, and can easily process and analyze various data. In practical applications, we often encounter situations where we need to read JSON files. This article will introduce how to use Pandas to read JSON files, and attach specific code examples. 1. Installation of Pandas
How do annotations in the Jackson library control JSON serialization and deserialization?
May 06, 2024 pm 10:09 PM
Annotations in the Jackson library control JSON serialization and deserialization: Serialization: @JsonIgnore: Ignore the property @JsonProperty: Specify the name @JsonGetter: Use the get method @JsonSetter: Use the set method Deserialization: @JsonIgnoreProperties: Ignore the property @ JsonProperty: Specify name @JsonCreator: Use constructor @JsonDeserialize: Custom logic
