Function.displayName

function.displayName属性获取函数的显示名字

Description 描述

当一个函数的displayName属性被定义，displayName属性将返回函数显示的名字。

function doSomething() {}

console.log(doSomething.displayName); // "undefined"

var popup = function(content) { console.log(content); };

popup.displayName = 'Show Popup';

console.log(popup.displayName); // "Show Popup"

可以在函数表达式重定义函数的显示名字function expression:

var object = {
  someMethod: function() {}
};

object.someMethod.displayName = 'someMethod';

console.log(object.someMethod.displayName); // logs "someMethod"

try { someMethod } catch(e) { console.log(e); }
// ReferenceError: someMethod is not defined

可以动态修改函数的显示名称：

var object = {
  // anonymous
  someMethod: function(value) {
    this.displayName = 'someMethod (' + value + ')';
  }
};

console.log(object.someMethod.displayName); // "undefined"

object.someMethod('123')
console.log(object.someMethod.displayName); // "someMethod (123)"

Examples 例子

It is usually preferred by consoles and profilers over func.name to display the name of a function.

在控制台输入下面的代码，控制台打印出 "function My Function()"：

var a = function() {};
a.displayName = 'My Function';

a; // "function My Function()"

Specifications 规范

不属于任何规范

Browser compatibility 浏览器兼容性