是否可以覆盖 JavaScript 的 toString() 函数来为调试提供有意义的输出? [英] Is it possible to override JavaScript's toString() function to provide meaningful output for debugging?
问题描述
当我在我的 JavaScript 程序中console.log()
一个对象时,我只看到输出 [object Object]
,这对弄清楚是什么不是很有帮助对象(甚至是什么类型的对象).
When I console.log()
an object in my JavaScript program, I just see the output [object Object]
, which is not very helpful in figuring out what object (or even what type of object) it is.
在 C# 中,我习惯于覆盖 ToString()
以便能够自定义对象的调试器表示.我可以在 JavaScript 中做类似的事情吗?
In C# I'm used to overriding ToString()
to be able to customize the debugger representation of an object. Is there anything similar I can do in JavaScript?
推荐答案
您也可以在 Javascript 中覆盖 toString
.见示例:
You can override toString
in Javascript as well. See example:
function Foo() {}
// toString override added to prototype of Foo class
Foo.prototype.toString = function() {
return "[object Foo]";
}
var f = new Foo();
console.log("" + f); // console displays [object Foo]
参见这个 讨论如何在 JavaScript 中确定对象类型名称.
See this discussion on how to determine object type name in JavaScript.
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