从 Javascript 函数引用中获取名称为字符串？
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Get name as String from a Javascript function reference?
提问by Gili
I want to do the opposite of Get JavaScript function-object from its name as a string?
我想做与从名称中获取 JavaScript 函数对象相反的字符串作为字符串？
That is, given:
也就是说，给定：
function foo()
{}
function bar(callback)
{
var name = ???; // how to get "foo" from callback?
}
bar(foo);
How do I get the name of the function behind a reference?
如何获取引用背后的函数名称？
采纳答案by Phrogz
If you can't use myFunction.namethen you can:
如果你不能使用，myFunction.name那么你可以：
// Add a new method available on all function values
Function.prototype.getName = function(){
// Find zero or more non-paren chars after the function start
return /function ([^(]*)/.exec( this+"" )[1];
};
Or for modern browsers that don't support the nameproperty (do they exist?) add it directly:
或者对于不支持该name属性的现代浏览器（它们是否存在？）直接添加它：
if (Function.prototype.name === undefined){
// Add a custom property to all function values
// that actually invokes a method to get the value
Object.defineProperty(Function.prototype,'name',{
get:function(){
return /function ([^(]*)/.exec( this+"" )[1];
}
});
}
回答by gdoron is supporting Monica
回答by kojiro
function bar(callback){
var name=callback.toString();
var reg=/function ([^\(]*)/;
return reg.exec(name)[1];
}
>>> function foo() { };
>>> bar(foo);
"foo"
>>> bar(function(){});
""
回答by David Fooks
You can extract the object and function name with:
您可以使用以下命令提取对象和函数名称：
function getFunctionName()
{
return (new Error()).stack.split('\n')[2].split(' ')[5];
}
For example:
例如：
function MyObject()
{
}
MyObject.prototype.hi = function hi()
{
console.log(getFunctionName());
};
var myObject = new MyObject();
myObject.hi(); // outputs "MyObject.hi"
回答by osahyoun
var x = function fooBar(){};
console.log(x.name);
// "fooBar"
回答by Tiago Peczenyj
try to access the .nameproperty:
尝试访问该.name属性：
callback.name
回答by JD Philippe
for me, with just a little modification (adding \ before parent), this work:
对我来说，只需稍作修改（在父级之前添加 \），这项工作：
if (Function.prototype.name === undefined){
// Add a custom property to all function values
// that actually invokes a method to get the value
Object.defineProperty(Function.prototype,'name',{
get:function(){
return /function ([^\(]*)/.exec( this+"" )[1];
}
});
}
回答by Pipe2290
If you were looking for the function on an specific object event, this may help:
如果您正在寻找特定对象事件的函数，这可能会有所帮助：
var a = document.form1
a.onsubmit.name
