+ 炽灼残渣新增保存功能

+ 格式化代码

modules/tools.js

@@ -0,0 +1,34 @@
+class IO {
+    constructor(scope) {
+        this.scope = scope
+    }
+
+    read(id) {
+        let key = `${this.scope}/${id}`
+        return localStorage.getItem(key)
+    }
+
+    write(id, data) {
+        let key = `${this.scope}/${id}`
+        localStorage.setItem(key, data)
+    }
+
+    remove(id) {
+        let key = `${this.scope}/${id}`
+        localStorage.removeItem(key)
+    }
+
+    listKeys() {
+        let keys = []
+        for (const key in localStorage) {
+            if (Object.hasOwnProperty.call(localStorage, key) &&
+                key.startsWith(this.scope)) {
+                    let i = key.indexOf('/') + 1
+                keys.push(key.slice(i))
+            }
+        }
+        return keys
+    }
+}
+
+export { IO }