把几个基础小功能迁移到独立的 sol.tool 库中

index.js

@@ -0,0 +1,25 @@
+/* 基础小工具，可通用于服务端和用户端
+ */
+
+module.exports = {
+  sleep: (ms) => new Promise((resolve, reject) => setTimeout(resolve, ms)),
+  parseJsonPossible(value) {
+    try {
+      return JSON.parse(value)
+    } catch (e) {
+      return value
+    }
+  },
+  sortAndFilterJson({ fields, entity, exclude = [] } = {}) {
+    const newEntity = {}
+    for (let key of Object.keys(fields).sort()) {
+      if (typeof (entity[key] !== 'undefined') && !Number.isNaN(entity[key]) && entity[key] !== Infinity) {
+        newEntity[key] = entity[key]
+      }
+    }
+    for (let exkey of exclude) {
+      delete newEntity[exkey]
+    }
+    return JSON.stringify(newEntity)
+  },
+}