是否有一个快速和简单的方法来编码JavaScript对象到字符串,我可以通过GET请求传递?
没有jQuery,没有其他框架-只有纯JavaScript:)
是否有一个快速和简单的方法来编码JavaScript对象到字符串,我可以通过GET请求传递?
没有jQuery,没有其他框架-只有纯JavaScript:)
当前回答
以更好的方式做这件事。
它可以处理标准查询形式的递归对象或数组,如a=val&b[0]=val&b[1]=val&c=val&d[some key]=val。这是最后一个函数。
逻辑、功能
const objectToQueryString = (initialObj) => {
const reducer = (obj, parentPrefix = null) => (prev, key) => {
const val = obj[key];
key = encodeURIComponent(key);
const prefix = parentPrefix ? `${parentPrefix}[${key}]` : key;
if (val == null || typeof val === 'function') {
prev.push(`${prefix}=`);
return prev;
}
if (['number', 'boolean', 'string'].includes(typeof val)) {
prev.push(`${prefix}=${encodeURIComponent(val)}`);
return prev;
}
prev.push(Object.keys(val).reduce(reducer(val, prefix), []).join('&'));
return prev;
};
return Object.keys(initialObj).reduce(reducer(initialObj), []).join('&');
};
例子
const testCase1 = {
name: 'Full Name',
age: 30
}
const testCase2 = {
name: 'Full Name',
age: 30,
children: [
{name: 'Child foo'},
{name: 'Foo again'}
],
wife: {
name: 'Very Difficult to say here'
}
}
console.log(objectToQueryString(testCase1));
console.log(objectToQueryString(testCase2));
现场测试
展开下面的代码片段,在浏览器中验证结果-
const objectToQueryString = (initialObj) => { const reducer = (obj, parentPrefix = null) => (prev, key) => { const val = obj[key]; key = encodeURIComponent(key); const prefix = parentPrefix ? `${parentPrefix}[${key}]` : key; if (val == null || typeof val === 'function') { prev.push(`${prefix}=`); return prev; } if (['number', 'boolean', 'string'].includes(typeof val)) { prev.push(`${prefix}=${encodeURIComponent(val)}`); return prev; } prev.push(Object.keys(val).reduce(reducer(val, prefix), []).join('&')); return prev; }; return Object.keys(initialObj).reduce(reducer(initialObj), []).join('&'); }; const testCase1 = { name: 'Full Name', age: 30 } const testCase2 = { name: 'Full Name', age: 30, children: [ {name: 'Child foo'}, {name: 'Foo again'} ], wife: { name: 'Very Difficult to say here' } } console.log(objectToQueryString(testCase1)); console.log(objectToQueryString(testCase2));
需要考虑的事情。
它跳过函数、null和未定义的值 它跳过空对象和数组的键和值。 它不处理用new Number(1)或new String('my String ')创建的Number或String对象,因为没有人应该这样做
其他回答
Ruby on Rails和PHP样式的查询生成器
该方法将JavaScript对象转换为URI查询字符串。它还处理嵌套数组和对象(在Ruby on Rails和PHP语法中):
function serializeQuery(params, prefix) {
const query = Object.keys(params).map((key) => {
const value = params[key];
if (params.constructor === Array)
key = `${prefix}[]`;
else if (params.constructor === Object)
key = (prefix ? `${prefix}[${key}]` : key);
if (typeof value === 'object')
return serializeQuery(value, key);
else
return `${key}=${encodeURIComponent(value)}`;
});
return [].concat.apply([], query).join('&');
}
使用示例:
let params = {
a: 100,
b: 'has spaces',
c: [1, 2, 3],
d: { x: 9, y: 8}
}
serializeQuery(params)
// returns 'a=100&b=has%20spaces&c[]=1&c[]=2&c[]=3&d[x]=9&d[y]=8
jQuery有一个函数jQuery.param()。如果你已经在使用它,你可以使用这个:
例子:
var params = { width:1680, height:1050 };
var str = jQuery.param( params );
STR现在包含宽度=1680&高度=1050。
在ES7中,你可以用一行写:
const serialize = (obj) => (Object.entries(obj).map(i => [i[0], encodeURIComponent(i[1])].join('=')).join('&'))
在讨论了一些最重要的答案之后,我编写了另一个实现,它也可以处理一些边缘情况
function serialize(params, prefix) {
return Object.entries(params).reduce((acc, [key, value]) => {
// remove whitespace from both sides of the key before encoding
key = encodeURIComponent(key.trim());
if (params.constructor === Array ) {
key = `${prefix}[]`;
} else if (params.constructor === Object) {
key = (prefix ? `${prefix}[${key}]` : key);
}
/**
* - undefined and NaN values will be skipped automatically
* - value will be empty string for functions and null
* - nested arrays will be flattened
*/
if (value === null || typeof value === 'function') {
acc.push(`${key}=`);
} else if (typeof value === 'object') {
acc = acc.concat(serialize(value, key));
} else if(['number', 'boolean', 'string'].includes(typeof value) && value === value) { // self-check to avoid NaN
acc.push(`${key}=${encodeURIComponent(value)}`);
}
return acc;
}, []);
}
function objectToQueryString(queryParameters) {
return queryParameters ? serialize(queryParameters).join('&'): '';
}
let x = objectToQueryString({
foo: 'hello world',
bar: {
blah: 123,
list: [1, 2, 3],
'nested array': [[4,5],[6,7]] // will be flattened
},
page: 1,
limit: undefined, // field will be ignored
check: false,
max: NaN, // field will be ignored
prop: null,
' key value': 'with spaces' // space in key will be trimmed out
});
console.log(x); // foo=hello%20world&bar[blah]=123&bar[list][]=1&bar[list][]=2&bar[list][]=3&bar[nested%20array][][]=4&bar[nested%20array][][]=5&bar[nested%20array][][]=6&bar[nested%20array][][]=7&page=1&check=false&prop=&key%20value=with%20spaces
参考答案@user187291,添加“isArray”作为参数,使要转换的JSON嵌套数组。
data : {
staffId : "00000001",
Detail : [ {
"identityId" : "123456"
}, {
"identityId" : "654321"
} ],
}
要得到结果:
staffId=00000001&Detail[0].identityId=123456&Detail[1].identityId=654321
serialize = function(obj, prefix, isArray) {
var str = [],p = 0;
for (p in obj) {
if (obj.hasOwnProperty(p)) {
var k, v;
if (isArray)
k = prefix ? prefix + "[" + p + "]" : p, v = obj[p];
else
k = prefix ? prefix + "." + p + "" : p, v = obj[p];
if (v !== null && typeof v === "object") {
if (Array.isArray(v)) {
serialize(v, k, true);
} else {
serialize(v, k, false);
}
} else {
var query = k + "=" + v;
str.push(query);
}
}
}
return str.join("&");
};
serialize(data, "prefix", false);