refactor: 使用flutter对原先的web项目重构，正在进行中

tmp/js/levels/index.js

@@ -0,0 +1,26 @@
+import tutorial from './tutorial.js';
+import jump from './jump.js';
+import endurance from './endurance.js';
+import boss from './boss.js';
+import troll from './troll.js';
+
+const raw = [...tutorial, ...jump, ...endurance, ...boss, ...troll];
+raw.forEach((l, i) => { l.index = i; l.builtin = true; });
+
+export const LEVELS = raw;
+
+export const TYPE_LABEL = {
+  jump: '跳刺', endur: '耐久', boss: 'BOSS', troll: '坑向', custom: '自制',
+};
+export const TYPE_CLASS = {
+  jump: 't-jump', endur: 't-endur', boss: 't-boss', troll: 't-troll', custom: 't-custom',
+};
+
+let uid = 0;
+export function makeCustomLevel(data) {
+  return { ...data, id: 'u' + (Date.now() % 100000) + (uid++), type: 'custom', builtin: false, index: -1 };
+}
+
+export function findLevel(id) {
+  return LEVELS.find(l => l.id === id);
+}