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doc: update docs/dart.md (#814)

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### Current behavior
The current asynchronous login sample code has the following issues:
1. The `main` function tries to use `await userName()`, but `userName` is a string variable, not a function.
2. the `login` function should be called and `await` should be used to wait for its result.
### Expected behavior
The `main` function should correctly call the `login` function and use `await` to wait for the result, then print out the username.
### Sample code
Here is the corrected code:
```dart
Future<String> login() {
String userName = "Temidjoy";
return Future.delayed(
Duration(seconds: 4), () => userName
).
}
main() async {
print('Authenticating please wait...') The
String result = await login();
String result = await login(); print(result);
} f0da2a3397
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jaywcjlove
2024-08-15 01:10:54 +00:00
parent 4ee2e1bc0c
commit 6a18428838
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docs/dart.html
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@ -699,7 +699,8 @@
</span><span class="code-line"><span class="token comment">// 异步</span>
</span><span class="code-line"><span class="token function">main</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token keyword">async</span> <span class="token punctuation">{</span>
</span><span class="code-line"> <span class="token function">print</span><span class="token punctuation">(</span><span class="token string-literal"><span class="token string">'Authenticating please wait...'</span></span><span class="token punctuation">)</span><span class="token punctuation">;</span>
</span><span class="code-line"> <span class="token function">print</span><span class="token punctuation">(</span><span class="token keyword">await</span> <span class="token function">userName</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
</span><span class="code-line"> <span class="token class-name">String</span> result <span class="token operator">=</span> <span class="token keyword">await</span> <span class="token function">login</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
</span><span class="code-line"> <span class="token function">print</span><span class="token punctuation">(</span>result<span class="token punctuation">)</span><span class="token punctuation">;</span>
</span><span class="code-line"><span class="token punctuation">}</span>
</span></code></pre>
</div></div></div></div></div><div class="wrap h2body-exist"><div class="wrap-header h2wrap"><h2 id="各种各样的"><a aria-hidden="true" tabindex="-1" href="#各种各样的"><span class="icon icon-link"></span></a>各种各样的</h2><div class="wrap-body">