function isEqual(x, y) {
// 如果全等则直接返回 true
if (x === y) {
return true;
} else if (
typeof x === "object" &&
x !== null &&
typeof y === "object" &&
y !== null
) {
let xKeys = Object.keys(x);
let yKeys = Object.keys(y);
// 如果key的数量不一致,直接返回 false;
if (xKeys.length !== yKeys.length) {
return false;
}
for (const key of xKeys) {
if (x[key] === y[key]) {
return true;
} else {
return false;
}
}
} else {
return false;
}
}
console.log(isEqual([1, 2, 3], [1, 2, 3])); // true
console.log(isEqual([1, 2, 3], [1, 2, 3, 5])); // false
console.log(isEqual(null, undefined)); // false
console.log(isEqual(null, true)); // false
console.log(isEqual(null, false)); // false
console.log(isEqual(undefined, 0)); // false
console.log(isEqual(null, null)); // true
console.log(isEqual(NaN, NaN)); // false
console.log(isEqual(false, 0)); // false
console.log(isEqual({ a: 1 }, { a: 1 })); // true
console.log(isEqual({ a: 1 }, { a: 1, b: 2 })); // false
参考:https://github.com/shfshanyue/Daily-Question/issues/614#issuecomment-886135655