fix: 修复 Unicode 转义函数中的转义字符格式

Author: SouSuoKe

tools/unicode-escape/app.html

@@ -229,9 +229,9 @@ <h1>Unicode 转义</h1>
   return Array.from(input).map(char => {
     const code = char.codePointAt(0);
     if (code <= 0xffff) {
-      return "\u" + code.toString(16).padStart(4, "0");
+      return "\\u" + code.toString(16).padStart(4, "0");
     }
-    return "\u{" + code.toString(16) + "}";
+    return "\\u{" + code.toString(16) + "}";
   }).join("");
 }