数组和对象的深拷贝_Java对象深拷贝工具类

function deepCopy (obj, cache) {
    if (cache === void 0) cache = []
    if (obj === null || typeof obj !== 'object') return obj
    var hit = find(cache, function (c) {
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      return c.original === obj
    })
    if (hit) return hit.copy

    var copy = Array.isArray(obj) ? [] : {}
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    cache.push({
      original: obj,
      copy: copy
    })

    Object.keys(obj).forEach(key => {
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      copy[key] = this.deepCopy(obj[key], cache)
    })

    return copy
  }
  function find (list, f) {
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    return list.filter(f)[0]
  }