perf: 流响应

src/api/fetch.ts

@@ -0,0 +1,47 @@
+interface StreamFetchProps {
+  url: string;
+  data: any;
+  onMessage: (text: string) => void;
+}
+export const streamFetch = ({ url, data, onMessage }: StreamFetchProps) =>
+  new Promise(async (resolve, reject) => {
+    try {
+      const res = await fetch(url, {
+        method: 'POST',
+        headers: {
+          'Content-Type': 'application/json'
+        },
+        body: JSON.stringify(data)
+      });
+      const reader = res.body?.getReader();
+      if (!reader) return;
+      const decoder = new TextDecoder();
+      let responseText = '';
+
+      const read = async () => {
+        const { done, value } = await reader?.read();
+        if (done) {
+          if (res.status === 200) {
+            resolve(responseText);
+          } else {
+            try {
+              const parseError = JSON.parse(responseText);
+              reject(parseError?.message || '请求异常');
+            } catch (err) {
+              reject('请求异常');
+            }
+          }
+
+          return;
+        }
+        const text = decoder.decode(value).replace(/<br\/>/g, '\n');
+        res.status === 200 && onMessage(text);
+        responseText += text;
+        read();
+      };
+      read();
+    } catch (err: any) {
+      console.log(err, '====');
+      reject(typeof err === 'string' ? err : err?.message || '请求异常');
+    }
+  });