我如何比较JavaScript中的2个函数 [英] how do I compare 2 functions in javascript
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问题描述
如何比较javascript中的2个函数?
我不是在谈论内部参考。说
var a = function(){return 1;};
var b = function(){return 1;};
是否可以比较 a
和 b
?
解决方案
var a = b =函数(c){return c; };
//这里,你可以使用=== b,因为它们指向相同的内存,它们是相同的类型
var a = function(c){return c ; },
b = function(c){return c; };
//在这里你可以使用那个节省了字节的Andy E(它隐式地把函数转换成它的正文文本作为字符串),
''+ a ==''+湾
//这是场景背后发生的要点:$ b
$ b a.toString()== b.toString()
How do I compare 2 functions in javascript? I am not talking about internal reference. Say
var a = function(){return 1;};
var b = function(){return 1;};
Is it possible to compare a
and b
?
解决方案
var a = b = function( c ){ return c; };
//here, you can use a === b because they're pointing to the same memory and they're the same type
var a = function( c ){ return c; },
b = function( c ){ return c; };
//here you can use that byte-saver Andy E used (which is implicitly converting the function to it's body's text as a String),
''+a == ''+b.
//this is the gist of what is happening behind the scences:
a.toString( ) == b.toString( )
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