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							- let systemInfo;
 
- export function getSystemInfoSync() {
 
-     if (systemInfo == null) {
 
-         systemInfo = wx.getSystemInfoSync();
 
-     }
 
-     return systemInfo;
 
- }
 
- function compareVersion(v1, v2) {
 
-     v1 = v1.split('.');
 
-     v2 = v2.split('.');
 
-     const len = Math.max(v1.length, v2.length);
 
-     while (v1.length < len) {
 
-         v1.push('0');
 
-     }
 
-     while (v2.length < len) {
 
-         v2.push('0');
 
-     }
 
-     for (let i = 0; i < len; i++) {
 
-         const num1 = parseInt(v1[i], 10);
 
-         const num2 = parseInt(v2[i], 10);
 
-         if (num1 > num2) {
 
-             return 1;
 
-         }
 
-         if (num1 < num2) {
 
-             return -1;
 
-         }
 
-     }
 
-     return 0;
 
- }
 
- function gte(version) {
 
-     const system = getSystemInfoSync();
 
-     return compareVersion(system.SDKVersion, version) >= 0;
 
- }
 
- export function canIUseModel() {
 
-     return gte('2.9.3');
 
- }
 
- export function canIUseFormFieldButton() {
 
-     return gte('2.10.3');
 
- }
 
- export function canIUseAnimate() {
 
-     return gte('2.9.0');
 
- }
 
- export function canIUseGroupSetData() {
 
-     return gte('2.4.0');
 
- }
 
- export function canIUseNextTick() {
 
-     try {
 
-         return wx.canIUse('nextTick');
 
-     }
 
-     catch (e) {
 
-         return gte('2.7.1');
 
-     }
 
- }
 
- export function canIUseCanvas2d() {
 
-     return gte('2.9.0');
 
- }
 
- export function canIUseGetUserProfile() {
 
-     return !!wx.getUserProfile;
 
- }
 
 
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