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[英]typeof of an object property (number) on passing to IIFE is returning undefined. Why?
[英]Why is this IIFE returning error undefined?
為什么會返回:Uncaught ReferenceError: winConditions is not defined?
我在 function 中返回 winConditions,然后運行 function,然后運行 console.log(winConditions),為什么它不起作用?
const gameBoard = (() => {
const board = [null, null, null, null, null, null, null, null, null]
let applyWinConditions = () => {
const winConditions = [[board[0], board[1], board[2]], [board[3], board[4], board[5]],
[board[6], board[7], board[8]], [board[0], board[3], board[6]],
[board[1], board[4], board[7]], [board[2], board[5], board[8]],
[board[0], board[4], board[8]], [board[2], board[4], board[6]]];
console.log("e")
return {
winConditions
}
};
applyWinConditions();
console.log(winConditions)
return {
applyWinConditions: applyWinConditions,
}
})();
看來您正在嘗試記錄一個超出 scope 的變量。
winConditions 是在 applyWinConditions 內部定義的,因此在外部不可用,以便 console.log 可以看到它。
嘗試這樣的事情:
console.log("winConditions", applyWinConditions());
您應該看到 function 的返回值,其中 winConditions 具有您期望的值。
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