36 lines
1.1 KiB
JavaScript
36 lines
1.1 KiB
JavaScript
// 判断arr是否为一个数组，返回一个bool值
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function isArray(arr) {
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return Object.prototype.toString.call(arr) === '[object Array]';
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}
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// 深度克隆
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function deepClone(obj, cache = new WeakMap()) {
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if (obj === null || typeof obj !== 'object') return obj;
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if (cache.has(obj)) return cache.get(obj);
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let clone;
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if (obj instanceof Date) {
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clone = new Date(obj.getTime());
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} else if (obj instanceof RegExp) {
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clone = new RegExp(obj);
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} else if (obj instanceof Map) {
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clone = new Map(Array.from(obj, ([key, value]) => [key, deepClone(value, cache)]));
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} else if (obj instanceof Set) {
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clone = new Set(Array.from(obj, value => deepClone(value, cache)));
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} else if (Array.isArray(obj)) {
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clone = obj.map(value => deepClone(value, cache));
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} else if (Object.prototype.toString.call(obj) === '[object Object]') {
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clone = Object.create(Object.getPrototypeOf(obj));
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cache.set(obj, clone);
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for (const [key, value] of Object.entries(obj)) {
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clone[key] = deepClone(value, cache);
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}
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} else {
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clone = Object.assign({}, obj);
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}
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cache.set(obj, clone);
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return clone;
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}
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export default deepClone;
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