js并列条件

// 布尔并列条件
let a = true;
let b = false;

if (a && b) {
    console.log('Both a and b are true');
} else {
    console.log('At least one of a or b is false');
}

// 表达式并列条件
let age = 18;
let hasLicense = true;

if (age >= 18 || hasLicense) {
    console.log('Person can drive');
} else {
    console.log('Person cannot drive');
}

let value = 'Hello';

// 意外的结果，因为非空字符串被转换为true
if (value && true) {
    console.log('Value is truthy');
}

// 明确转换
if (!!value && true) {
    console.log('Value is explicitly truthy');
}

// 使用括号明确运算顺序
if ((value !== null && value !== undefined) && true) {
    console.log('Value is not null or undefined and is truthy');
}