為什么在執行此代碼時所有變數都未定義？
function checkStatus(a, b, c) {
let info = [a, b, c];
let name, age, status;
for (i = 0; i < info.length; i ) {
if (typeof info[i] === "string") {
name = info[i]
} else if (typeof info[i] === Number) {
age = info[i]
} else if (typeof info[i] === Boolean && info[i] === true) {
status = `You Are available for hire `
} else if (typeof info[i] === Boolean && info[i] === false) {
status = `You Are Not available for hire `
};
}
console.log(`Hello ${name} Your Age is ${age} and ${status}`);
}
console.log(checkStatus("yousef", 16, true));
console.log(checkStatus(16, "yousef", true));
console.log(checkStatus(true, 16, "yousef"));我得到這個輸出：
Hello yousef Your Age is undefined and undefined
Hello yousef Your Age is undefined and undefined
Hello yousef Your Age is undefined and undefined
uj5u.com熱心網友回復：
試試這個，數字和數字/布爾和布爾是兩個不同的東西
function checkStatus(a, b, c) {
let info = [a, b, c];
let name, age, status;
for (i = 0; i < info.length; i ) {
console.log( typeof info[i])
if (typeof info[i] === "string") {
name = info[i]
} else if (typeof info[i] === 'number') {
age = info[i]
} else if (typeof info[i] === 'boolean' && info[i] === true) {
status = `You Are available for hire `
} else if (typeof info[i] === Boolean && info[i] === false) {
status = `You Are Not available for hire `
};
}
console.log(`Hello ${name} Your Age is ${age} and ${status}`);
}
console.log(checkStatus("yousef", 16, true));
console.log(checkStatus(16, "yousef", true));
console.log(checkStatus(true, 16, "yousef"));
uj5u.com熱心網友回復：
運算子typeof回傳字串而不是物件，這意味著要檢查型別是否為數字，請typeof x === "number"注意"number"字串全部小寫，對于"boolean".
這是一個修復：
function checkStatus(a, b, c) {
let info = [a, b, c];
let name, age, status;
for (i = 0; i < info.length; i ) {
if (typeof info[i] === "string") {
name = info[i]
} else if (typeof info[i] === "number") {
age = info[i]
} else if (typeof info[i] === "boolean" && info[i] === true) {
status = `You Are available for hire `
} else if (typeof info[i] === "boolean" && info[i] === false) {
status = `You Are Not available for hire `
};
}
console.log(`Hello ${name} Your Age is ${age} and ${status}`);
}
console.log(checkStatus("yousef", 16, true));
console.log(checkStatus(16, "yousef", true));
console.log(checkStatus(true, 16, "yousef"));uj5u.com熱心網友回復：
Number是一個函式。您正在將typeof info[i]（這是一個字串）與Number哪個函式與typeof info[i] === Number. 那不是你想要的。
您想與typeof info[i]（'number'字串）進行比較typeof info[i] === 'number'
（函式）的類似情況Boolean- 您實際上想要使用'boolean'字串。
轉載請註明出處，本文鏈接：https://www.uj5u.com/gongcheng/507995.html
標籤：javascript 循环
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