diff --git a/public/inject.js b/public/inject.js
index 3afc196..a4fed7a 100644
--- a/public/inject.js
+++ b/public/inject.js
@@ -6,14 +6,21 @@
  * @see    {@link http://stackoverflow.com/questions/20499994/access-window-variable-from-content-script}
  */
 function injectScript(file_path, tag) {
-    var node = document.getElementsByTagName(tag)[0];
+    const node = document.getElementsByTagName(tag)[0];
     if (!node) {
         console.error('The "' + tag + '" tag is not available in the document.');
         return;
     }
-    var script = document.createElement('script');
+    // 移除之前的脚本
+    const oldScript = document.getElementById('yakit-injected-script');
+    if (oldScript) {
+        node.removeChild(oldScript);
+    }
+    const script = document.createElement('script');
     script.setAttribute('type', 'text/javascript');
     script.setAttribute('src', file_path);
+    script.setAttribute('id', 'yakit-injected-script');
+
     node.appendChild(script);
 }
 
diff --git a/src/components/EvalInTab.tsx b/src/components/EvalInTab.tsx
index e38e67a..fffab70 100644
--- a/src/components/EvalInTab.tsx
+++ b/src/components/EvalInTab.tsx
@@ -1,6 +1,7 @@
 import React, {useEffect, useState} from "react";
 import {Button} from "antd";
 import TextArea from "antd/lib/input/TextArea";
+import {wsc} from "@network/chrome";
 
 interface EvalInTabProps {
 }
@@ -18,28 +19,28 @@ export const EvalInTab: React.FC<EvalInTabProps> = () => {
             port.onDisconnect.addListener(function () {
                 console.error("Disconnected from port.");
             });
-            port.postMessage({ type: "TEST", fn_name: "Encrypt", args: inputData });
+            port.postMessage({type: "TEST", fn_name: "Encrypt", args: inputData});
         };
 
         chrome.runtime.onConnect.addListener(onConnectListener);
 
-        return () => {
-            chrome.runtime.onConnect.removeListener(onConnectListener);
-        };
+        // return () => {
+        //     chrome.runtime.onConnect.removeListener(onConnectListener);
+        // };
     }, [inputData]);
 
-    const handleClick = () => {
-
-
-        chrome.tabs.query({ active: true, lastFocusedWindow: true }, function (tabs) {
-            console.log(tabs[0].title);
+    const handleClick = async () => {
+        if (!isScriptInjected) {
             chrome.scripting.executeScript({
-                target: { tabId: tabs[0].id },
+                target: {tabId: await wsc.getTabId()},
                 files: ['inject.js'],
             }).then(injectResults => {
                 console.log(injectResults)
+                setIsScriptInjected(true);
             });
-        });
+        }
+        console.log("injected script")
+
     };
 
     const handleInputChange = (event: React.ChangeEvent<HTMLTextAreaElement>) => {
diff --git a/src/network/chrome.ts b/src/network/chrome.ts
index e3371cf..93b2b62 100644
--- a/src/network/chrome.ts
+++ b/src/network/chrome.ts
@@ -50,5 +50,15 @@ export namespace wsc {
         chrome.runtime.sendMessage({action: ActionType.CLEARPROXY})
     }
 
-
+    export function getTabId() {
+        return new Promise<number>((resolve, reject) => {
+            chrome.tabs.query({ active: true, lastFocusedWindow: true }, function (tabs) {
+                if (tabs.length) {
+                    resolve(tabs[0].id);
+                } else {
+                    reject('No active tab found');
+                }
+            });
+        });
+    }
 }