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
var o = {a:1, b:2};
o.toString=function(){
return 'a='+this.a+', b='+this.b;
};
console.log(o);
console.log('Item: ' + o);
因为Javascript v1.0可以在任何地方工作(甚至是IE) 这是一种本地方法，允许在调试和生产过程中对对象进行定制 https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Global_Objects/Object/toString
有用的例子
var Ship=function(n,x,y){
this.name = n;
this.x = x;
this.y = y;
};
Ship.prototype.toString=function(){
return '"'+this.name+'" located at: x:'+this.x+' y:'+this.y;
};
alert([new Ship('Star Destroyer', 50.001, 53.201),
new Ship('Millennium Falcon', 123.987, 287.543),
new Ship('TIE fighter', 83.060, 102.523)].join('\n'));//now they can battle!
//"Star Destroyer" located at: x:50.001 y:53.201
//"Millennium Falcon" located at: x:123.987 y:287.543
//"TIE fighter" located at: x:83.06 y:102.523
还有，作为奖励
function ISO8601Date(){
return this.getFullYear()+'-'+(this.getMonth()+1)+'-'+this.getDate();
}
var d=new Date();
d.toString=ISO8601Date;//demonstrates altering native object behaviour
alert(d);
//IE6 Fri Jul 29 04:21:26 UTC+1200 2016
//FF&GC Fri Jul 29 2016 04:21:26 GMT+1200 (New Zealand Standard Time)
//d.toString=ISO8601Date; 2016-7-29
其他回答
如果你想要的只是一个字符串输出，那么这应该工作:
var o = {a:1, b:2};
o.toString=function(){
return 'a='+this.a+', b='+this.b;
};
console.log(o);
console.log('Item: ' + o);
因为Javascript v1.0可以在任何地方工作(甚至是IE) 这是一种本地方法，允许在调试和生产过程中对对象进行定制 https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Global_Objects/Object/toString
有用的例子
var Ship=function(n,x,y){
this.name = n;
this.x = x;
this.y = y;
};
Ship.prototype.toString=function(){
return '"'+this.name+'" located at: x:'+this.x+' y:'+this.y;
};
alert([new Ship('Star Destroyer', 50.001, 53.201),
new Ship('Millennium Falcon', 123.987, 287.543),
new Ship('TIE fighter', 83.060, 102.523)].join('\n'));//now they can battle!
//"Star Destroyer" located at: x:50.001 y:53.201
//"Millennium Falcon" located at: x:123.987 y:287.543
//"TIE fighter" located at: x:83.06 y:102.523
还有，作为奖励
function ISO8601Date(){
return this.getFullYear()+'-'+(this.getMonth()+1)+'-'+this.getDate();
}
var d=new Date();
d.toString=ISO8601Date;//demonstrates altering native object behaviour
alert(d);
//IE6 Fri Jul 29 04:21:26 UTC+1200 2016
//FF&GC Fri Jul 29 2016 04:21:26 GMT+1200 (New Zealand Standard Time)
//d.toString=ISO8601Date; 2016-7-29
请不要使用此答案，因为它只在某些版本的Firefox中有效。没有其他浏览器支持它。使用加里钱伯斯解决方案。
toSource()是您正在寻找的函数，它将以JSON的形式写入。
var object = {};
object.first = "test";
object.second = "test2";
alert(object.toSource());
如果您正在使用Dojo javascript框架，那么已经有一个内置函数来完成此工作:Dojo . tojson()，它将像这样使用。
var obj = {
name: 'myObj'
};
dojo.toJson(obj);
它将返回一个字符串。如果要将对象转换为json数据，则添加第二个参数true。
dojo.toJson(obj, true);
http://dojotoolkit.org/reference-guide/dojo/toJson.html#dojo-tojson
如果你只是输出到控制台，你可以使用console.log('string:'， obj)。注意逗号。
