Update PNG_info_web.js

PNG_info_web.js

@@ -259,31 +259,36 @@
   let shadowRoot = null;
   let result = {};
   let png_info_blob = {};
-  //readNovelAITag源码参考于秋叶大佬
+  //readNovelAITag函数参考于秋叶大佬并进行了优化
   const readNovelAITag = async (file) => {
-    const buf = await file.arrayBuffer();
     let chunks = [];
+    let textChunks = [];
     try {
-      chunks = extractChunks(new Uint8Array(buf));
-    } catch (err) {
-      return chunks;
-    }
-    let textChunks = chunks.filter(function (chunk) {
-      return chunk.name === "tEXt" || chunk.name === "iTXt";
+    const buf = await file.arrayBuffer();
+    chunks = extractChunks(new Uint8Array(buf));
+    textChunks = chunks.filter(function (chunk) {
+    return chunk.name === "tEXt" || chunk.name === "iTXt";
     });
     textChunks = textChunks.map(function (chunk) {
-      if (chunk.name === "iTXt") {
-        let data = chunk.data.filter((x) => x != 0x0);
-        let txt = new TextDecoder().decode(data);
-        return {
-          keyword: "信息",
-          text: txt.slice(10),
-        };
-      }
-      return decode(chunk.data);
+    if (chunk.name === "iTXt") {
+    let data = chunk.data.filter((x) => x != 0x0);
+    let txt = new TextDecoder().decode(data);
+    return {
+    keyword: "信息",
+    text: txt.slice(10),
+    };
+    }
+    return decode(chunk.data);
     });
     return textChunks;
-  };
+    } catch (err) {
+    console.error(err);
+    } finally {
+    chunks = null;
+    textChunks = null;
+    }
+    return [];
+    };
 
   //dom转blob
   async function convertDomImageToBlob(imageElement) {