48 lines
1.1 KiB
JavaScript
48 lines
1.1 KiB
JavaScript
function deepEqual (prev, current) {
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if (prev === current) { // 基本类型比较，值，类型都相同 或者同为 null or undefined
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return true;
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}
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if ((!prev && current)
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|| (prev && !current)
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|| (!prev && !current)
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) {
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return false;
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}
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if (Array.isArray(prev)) {
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if (!Array.isArray(current)) return false;
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if (prev.length !== current.length) return false;
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for (let i = 0; i < prev.length; i++) {
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if (!deepEqual(current[i], prev[i])) {
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return false;
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}
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}
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return true;
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}
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if (typeof current === 'object') {
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if (typeof prev !== 'object') return false;
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const prevKeys = Object.keys(prev);
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const curKeys = Object.keys(current);
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if (prevKeys.length !== curKeys.length) return false;
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prevKeys.sort();
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curKeys.sort();
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for (let i = 0; i < prevKeys.length; i++) {
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if (prevKeys[i] !== curKeys[i]) return false;
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const key = prevKeys[i];
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if (!deepEqual(prev[key], current[key])) return false;
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}
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return true;
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}
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return false;
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}
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export default deepEqual;
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