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20220330_Vote/Ewide.Web.Entry/wwwroot/lib/xe-utils/clone.js

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+var objectToString = require('./staticObjectToString')
+
+var objectEach = require('./objectEach')
+var arrayEach = require('./arrayEach')
+
+function getCativeCtor (val, args) {
+  var Ctor = val.__proto__.constructor
+  return args ? new Ctor(args) : new Ctor()
+}
+
+function handleValueClone (item, isDeep) {
+  return isDeep ? copyValue(item, isDeep) : item
+}
+
+function copyValue (val, isDeep) {
+  if (val) {
+    switch(objectToString.call(val)) {
+      case "[object Object]": {
+        var restObj = Object.create(val.__proto__)
+        objectEach(val, function (item, key) {
+          restObj[key] = handleValueClone(item, isDeep)
+        })
+        return restObj
+      }
+      case "[object Date]":
+      case "[object RegExp]": {
+        return getCativeCtor(val, val.valueOf())
+      }
+      case "[object Array]":
+      case "[object Arguments]":  {
+        var restArr = []
+        arrayEach(val, function (item) {
+          restArr.push(handleValueClone(item, isDeep))
+        })
+        return restArr
+      }
+      case "[object Set]": {
+        var restSet = getCativeCtor(val)
+        restSet.forEach(function (item) {
+          restSet.add(handleValueClone(item, isDeep))
+        })
+        return restSet
+      }
+      case "[object Map]": {
+        var restMap = getCativeCtor(val)
+        restMap.forEach(function (item, key) {
+          restMap.set(key, handleValueClone(item, isDeep))
+        })
+        return restMap
+      }
+    }
+  }
+  return val
+}
+
+/**
+  * 浅拷贝/深拷贝
+  *
+  * @param {Object} obj 对象/数组
+  * @param {Boolean} deep 是否深拷贝
+  * @return {Object}
+  */
+function clone (obj, deep) {
+  if (obj) {
+    return copyValue(obj, deep)
+  }
+  return obj
+}
+
+module.exports = clone