In the code shown below, I have defined some constants. I want to useSymbol
to ensure each constant is unique. But when I use the following line of code:
if (isBtnDigitizePolygonClicked.value == true) { return polygDigiConstants.CONST_STRING_DIGITIZE; }
The value returned by the above code isSymbol('Digitize')
, but I expected it to beDigitize
as described in this tutorial:https://www. scaler.com/topics/enum-in-javascript/
Tutorial content:
const Direction = Object.freeze({ North: Symbol('north'), East: Symbol('east'), West: Symbol('west'), South: Symbol('south'), }) const Pole = Object.freeze({ North: Symbol('north'), South: Symbol('south'), }) console.log(Direction.North === Pole.North) 上述代码的输出为: false
Please tell me how to useSymbol
correctly to define properties.
polygDigiConstants.js
function define(name, value) { Object.defineProperty(polygDigiConstants, name, { value: value, enumerable: true, writable: false, }); } export let polygDigiConstants = {}; define('CONST_STRING_DIGITIZE', Symbol('Digitize')); define('CONST_STRING_STOP_DIGITIZE', Symbol('Stop')); define('CONST_STRING_CLEAR_DIGITIZED', Symbol('Clear'));
polygDigiConstants.js
JS
polygDigiConstants.CONST_STRING_DIGITIZE will give you the string 'Digitize' directly.