如何将JavaScript对象转换为字符串?
例子:
var o = {a:1, b:2}
console.log(o)
console.log('Item: ' + o)
输出:
对象{a=1, b=2} //非常好的可读输出:) Item: [object object] //不知道里面有什么:(
如何将JavaScript对象转换为字符串?
例子:
var o = {a:1, b:2}
console.log(o)
console.log('Item: ' + o)
输出:
对象{a=1, b=2} //非常好的可读输出:) Item: [object object] //不知道里面有什么:(
当前回答
/*
This function is as JSON.Stringify (but if you has not in your js-engine you can use this)
Params:
obj - your object
inc_ident - can be " " or "\t".
show_types - show types of object or not
ident - need for recoursion but you can not set this parameter.
*/
function getAsText(obj, inc_ident, show_types, ident) {
var res = "";
if (!ident)
ident = "";
if (typeof(obj) == "string") {
res += "\"" + obj + "\" ";
res += (show_types == true) ? "/* typeobj: " + typeof(obj) + "*/" : "";
} else if (typeof(obj) == "number" || typeof(obj) == "boolean") {
res += obj;
res += (show_types == true) ? "/* typeobj: " + typeof(obj) + "*/" : "";
} else if (obj instanceof Array) {
res += "[ ";
res += show_types ? "/* typeobj: " + typeof(obj) + "*/" : "";
res += "\r\n";
var new_ident = ident + inc_ident;
var arr = [];
for(var key in obj) {
arr.push(new_ident + getAsText(obj[key], inc_ident, show_types, new_ident));
}
res += arr.join(",\r\n") + "\r\n";
res += ident + "]";
} else {
var new_ident = ident + inc_ident;
res += "{ ";
res += (show_types == true) ? "/* typeobj: " + typeof(obj) + "*/" : "";
res += "\r\n";
var arr = [];
for(var key in obj) {
arr.push(new_ident + '"' + key + "\" : " + getAsText(obj[key], inc_ident, show_types, new_ident));
}
res += arr.join(",\r\n") + "\r\n";
res += ident + "}\r\n";
}
return res;
};
示例:
var obj = {
str : "hello",
arr : ["1", "2", "3", 4],
b : true,
vobj : {
str : "hello2"
}
}
var ForReading = 1, ForWriting = 2;
var fso = new ActiveXObject("Scripting.FileSystemObject")
f1 = fso.OpenTextFile("your_object1.txt", ForWriting, true)
f1.Write(getAsText(obj, "\t"));
f1.Close();
f2 = fso.OpenTextFile("your_object2.txt", ForWriting, true)
f2.Write(getAsText(obj, "\t", true));
f2.Close();
your_object1.txt:
{
"str" : "hello" ,
"arr" : [
"1" ,
"2" ,
"3" ,
4
],
"b" : true,
"vobj" : {
"str" : "hello2"
}
}
your_object2.txt:
{ /* typeobj: object*/
"str" : "hello" /* typeobj: string*/,
"arr" : [ /* typeobj: object*/
"1" /* typeobj: string*/,
"2" /* typeobj: string*/,
"3" /* typeobj: string*/,
4/* typeobj: number*/
],
"b" : true/* typeobj: boolean*/,
"vobj" : { /* typeobj: object*/
"str" : "hello2" /* typeobj: string*/
}
}
其他回答
由于firefox没有将某些对象stringify为屏幕对象;如果你想有相同的结果,如:JSON.stringify(obj):
function objToString (obj) {
var tabjson=[];
for (var p in obj) {
if (obj.hasOwnProperty(p)) {
tabjson.push('"'+p +'"'+ ':' + obj[p]);
}
} tabjson.push()
return '{'+tabjson.join(',')+'}';
}
var obj={
name:'xyz',
Address:'123, Somestreet'
}
var convertedString=JSON.stringify(obj)
console.log("literal object is",obj ,typeof obj);
console.log("converted string :",convertedString);
console.log(" convertedString type:",typeof convertedString);
function objToString (obj) {
var str = '{';
if(typeof obj=='object')
{
for (var p in obj) {
if (obj.hasOwnProperty(p)) {
str += p + ':' + objToString (obj[p]) + ',';
}
}
}
else
{
if(typeof obj=='string')
{
return '"'+obj+'"';
}
else
{
return obj+'';
}
}
return str.substring(0,str.length-1)+"}";
}
当然,要将对象转换为字符串,你必须使用自己的方法,例如:
function objToString (obj) {
var str = '';
for (var p in obj) {
if (Object.prototype.hasOwnProperty.call(obj, p)) {
str += p + '::' + obj[p] + '\n';
}
}
return str;
}
实际上,以上只是展示了一般方法;您可能希望使用诸如http://phpjs.org/functions/var_export:578或http://phpjs.org/functions/var_dump:604之类的东西
或者,如果你不使用方法(函数作为对象的属性),你可以使用新的标准(但在旧的浏览器中没有实现,尽管你也可以找到一个实用工具来帮助它们),JSON.stringify()。但同样,如果对象使用的函数或其他属性不能序列化为JSON,这将不起作用。
更新:
一个更现代的解决方案是:
function objToString (obj) {
let str = '';
for (const [p, val] of Object.entries(obj)) {
str += `${p}::${val}\n`;
}
return str;
}
or:
function objToString (obj) {
return Object.entries(obj).reduce((str, [p, val]) => {
return `${str}${p}::${val}\n`;
}, '');
}
我用for in和template literal来在字符串中有两个键-值对,这对我有用。
让obj = { 名称:“约翰”, 年龄:22岁 isDev:没错, }; let toStr = ""; For (let key in obj) { if (obj.hasOwnProperty(key)) { toStr += ' ${key} ${obj[key]} ' + ", "; } } console.log (toStr); console.log (typeof toStr);