if/else if分支后使用未声明的标识符

if (condition) {
    console.log(undeclaredVariable); // 未声明的标识符
} else if (anotherCondition) {
    console.log(anotherUndeclaredVariable); // 另一个未声明的标识符
}

let undeclaredVariable;
let anotherUndeclaredVariable;

if (condition) {
    undeclaredVariable = "some value";
    console.log(undeclaredVariable);
} else if (anotherCondition) {
    anotherUndeclaredVariable = "another value";
    console.log(anotherUndeclaredVariable);
}

if (condition) {
    let undeclaredVariable = "some value";
    console.log(undeclaredVariable);
} else if (anotherCondition) {
    let anotherUndeclaredVariable = "another value";
    console.log(anotherUndeclaredVariable);
}

let result;

if (condition) {
    result = "some value";
} else if (anotherCondition) {
    result = "another value";
}

console.log(result);