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
如果对象是一个jQuery对象,那么你应该使用:
obj.html()
而不是:
JSON.stringify(obj)
例子:
Var tr = $('tr') console.log('This does not work:') console.log (JSON.stringify (tr)) console.log('But this does:') console.log (tr.html ()) < script src = " https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js " > < /脚本> <表> < tr > < td > < / td > < td > b < / td > 表> < /
一个选项:
console.log('Item: ' + JSON.stringify(o));
另一个选项(正如soktinpk在评论中指出的那样),更适合控制台调试IMO:
console.log('Item: ', o);
Stringify-object是yeoman团队制作的一个很好的NPM库:https://www.npmjs.com/package/stringify-object
npm install stringify-object
然后:
const stringifyObject = require('stringify-object');
stringifyObject(myCircularObject);
显然,只有当循环对象使用JSON.stringify()会失败时,它才有趣;
1.
JSON.stringify(o);
Item: {"a":"1", "b":"2"}
2.
var o = {a:1, b:2};
var b=[]; Object.keys(o).forEach(function(k){b.push(k+":"+o[k]);});
b="{"+b.join(', ')+"}";
console.log('Item: ' + b);
项目:{a:1, b:2}
JSON似乎接受了第二个参数,可以帮助函数- replace,这以最优雅的方式解决了转换问题:
JSON.stringify(object, (key, val) => {
if (typeof val === 'function') {
return String(val);
}
return val;
});