如果你现在正在使用Restful API，并且你需要通过web项目来构建json格式字符串的响应，那么这篇文章将帮助你使用javascript来创建json格式字符串。这是非常有用的，我们将通过jQuery插件$.toJSON把数据对象转换为json格式。

使用JavaScript构建JSON格式字符串
JavaScript代码:
在这里包含了javascript代码。$(“#form”).submit(function(){}- delete_button是form标签的ID，我们通过element.val()调用表单输入框的值。代码如下：
复制代码 代码如下:
<script src="/UploadFiles/2021-04-02/jquery.min.js"><script src="jquery.json-2.2.js"><script src="GetPostAjax.js"><script type="text/javascript">
$(document).ready(function()
{
$("#form").submit(function(e){
e.preventDefault();
var username,email,password,gender;
username=$("#username").val();
email=$("#email").val();
password=$("#username").val();
gender=$("#gender").val();
if(username.length>0 && email.length>0 && password.length>0 &&gender.length>0)
{
//Creating Objects
var request = new Object();
var userDetails = new Object();
var user = new Object();
var websites=new Array();
user.name=username;
user.email=email;
user.password=password;
user.gender=gender;
//Array Push
if(website1.length>0)
websites.push(website1);
if(website2.length>0)
websites.push(website2);
if(website3.length>0)
websites.push(website3);
user.websites=websites;
userDetails.user = user;
request.userDetails = userDetails;
var jsonfy = $.toJSON(request);
// Encodes special characters
var encodedata = 'jsondata='+encodeURIComponent(jsonfy);
//Ajax Call
var url='website API URL';
post_data(url,encodedata, function(data) {
alert("Success");
});
}
});
});
</script">

HTML代码:
复制代码 代码如下:
<form method='post' action='' id='form'>
Name
<input type='text' name='username' id='username' />
Email
<input type='text' name='email' id='email' />
Password
<input type='text' name='password' id='password' />
Gender
<select name='gender' id='gender'><option value='male'>Male</option><option value='female'>Female</option></select>
Websites
<input type='text' id='website1' />
<input type='text' id='website2' />
<input type='text' id='website3' />
<input type='submit' id='submit'/>
</form>

JSON输出
复制代码 代码如下:
{
"userDetails":{
"user":{
"name":"Srinivas Tamada",
"email":"srinivas@9lessons.info",
"password":"Srinivas Tamada",
"gender":"male",
"websites":["www.software8.co","www.heatpress123.net","www.0769zzw.com"]
}
}
}

JSON Encoded
对特殊字符进行编码，会把以下字符进行编码：
复制代码 代码如下:
, / ? : @ & = + $ #
jsondata=%7B%22userDetails%22%3A%7B%22user%22%3A%7B%22name%22%3A%22Srinivas%20Tamada%22%2C%22email%22%3A%22srinivas%409lessons.info%22%2C%22password%22%3A%22Srinivas%20Tamada%22%2C%22gender%22%3A%22male%22%2C%22websites%22%3A%5B%22www.9lessons.info%22%2C%22www.egglabs.in%22%2C%22www.fglogin.com%22%5D%7D%7D%7D

GetPostAjax.js
这里定义了jquery的ajax请求方法。
复制代码 代码如下:
function post_data(url,encodedata, success){
$.ajax({
type:"POST",
url:url,
data :encodedata,
dataType:"json",
restful:true,
contentType: 'application/json',
cache:false,
timeout:20000,
async:true,
beforeSend :function(data) { },
success:function(data){
success.call(this, data);
},
error:function(data){
alert("Error In Connecting");
}
});
}