feat: add the function of copying configuration code; 🌟

新增：复制配置项代码的功能；

src/utils/formatter.js

@@ -0,0 +1,68 @@
+/**
+ * 把对象按照 js配置文件的格式进行格式化
+ * @param obj 格式化的对象
+ * @param dep 层级，此项无需传值
+ * @returns {string}
+ */
+function formatConfig(obj, dep) {
+  dep = dep || 1
+  const LN = '\n', TAB = '  '
+  let indent = ''
+  for (let i = 0; i < dep; i++) {
+    indent += TAB
+  }
+  let isArray = false, arrayLastIsObj = false
+  let str = '', prefix = '{', subfix = '}'
+  if (Array.isArray(obj)) {
+    isArray = true
+    prefix = '['
+    subfix = ']'
+    str = obj.map((item, index) => {
+      let format = ''
+      if (typeof item == 'function') {
+        //
+      } else if (typeof item == 'object') {
+        arrayLastIsObj = true
+        format = `${LN}${indent}${formatConfig(item,dep + 1)},`
+      } else if (typeof item == 'number' && !isNaN(item)) {
+        format = `${item},`
+      } else if (typeof item == 'string') {
+        format = `'${item}',`
+      }
+      if (index == obj.length - 1) {
+        format = format.substring(0, format.length - 1)
+      } else {
+        arrayLastIsObj = false
+      }
+      return format
+    }).join('')
+  } else if (typeof obj != 'function' && typeof obj == 'object') {
+    str = Object.keys(obj).map((key, index, keys) => {
+      const val = obj[key]
+      let format = ''
+      if (typeof val == 'function') {
+        //
+      } else if (typeof val == 'object') {
+        format = `${LN}${indent}${key}: ${formatConfig(val,dep + 1)},`
+      } else if (typeof val == 'number' && !isNaN(val)) {
+        format = `${LN}${indent}${key}: ${val},`
+      } else if (typeof val == 'string') {
+        format = `${LN}${indent}${key}: '${val}',`
+      }
+      if (index == keys.length - 1) {
+        format = format.substring(0, format.length - 1)
+      }
+      return format
+    }).join('')
+  }
+  const len = TAB.length
+  if (indent.length >= len) {
+    indent = indent.substring(0, indent.length - len)
+  }
+  if (!isArray || arrayLastIsObj) {
+    subfix = LN + indent +subfix
+  }
+  return`${prefix}${str}${subfix}`
+}
+
+module.exports = {formatConfig}