From 2fd9879eecfa799dec599cad53da14cee7d26b1f Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E5=B0=8F=E6=9F=93?=
 <56108982+XR-stb@users.noreply.github.com>
Date: Mon, 3 Apr 2023 11:22:01 +0800
Subject: [PATCH 1/2] =?UTF-8?q?=E4=BF=AE=E5=A4=8D=E4=BA=86=E5=89=8D?=
 =?UTF-8?q?=E7=AB=AF=E8=BE=93=E5=85=A5=E4=B8=AD=E6=96=87=E5=AD=97=E7=AC=A6?=
 =?UTF-8?q?=E5=86=8D=E5=88=A0=E9=99=A4=E4=BC=9A=E5=87=BA=E7=8E=B0=E7=9A=84?=
 =?UTF-8?q?bug?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

具体的bug复现，见：https://github.com/blueloveTH/pocketpy/issues/50
---
 web/index.js | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/web/index.js b/web/index.js
index 8755b9a6..1a723488 100644
--- a/web/index.js
+++ b/web/index.js
@@ -145,7 +145,12 @@ function term_init() {
         case '\u007F': // Backspace (DEL)
           // Do not delete the prompt
           if (term._core.buffer.x > 4) {    // '>>> ' or '... '
-            term.write('\b \b');
+            var re=/[^\u4E00-\u9FA5]/;
+            if (re.test(command.charAt(command.length-1))){//判断前一个字符是否为中文
+              term.write('\b \b');//false
+            }else{
+              term.write('\b\b \b');//中文占两个字节，ascii字符占一个字节
+            }
             if (command.length > 0) {
               command = command.substr(0, command.length - 1);
             }
@@ -158,4 +163,4 @@ function term_init() {
           }
       }
     });
-}
\ No newline at end of file
+}

From f884351c4eb11a9abe23da13687a7b86e359f3b7 Mon Sep 17 00:00:00 2001
From: BLUELOVETH <blueloveTH@foxmail.com>
Date: Tue, 4 Apr 2023 21:10:02 +0800
Subject: [PATCH 2/2] Update index.js

---
 web/index.js | 20 ++++++++------------
 1 file changed, 8 insertions(+), 12 deletions(-)

diff --git a/web/index.js b/web/index.js
index 1a723488..2621b788 100644
--- a/web/index.js
+++ b/web/index.js
@@ -143,18 +143,14 @@ function term_init() {
           term.write(need_more_lines ? "... " : ">>> ");
           break;
         case '\u007F': // Backspace (DEL)
-          // Do not delete the prompt
-          if (term._core.buffer.x > 4) {    // '>>> ' or '... '
-            var re=/[^\u4E00-\u9FA5]/;
-            if (re.test(command.charAt(command.length-1))){//判断前一个字符是否为中文
-              term.write('\b \b');//false
-            }else{
-              term.write('\b\b \b');//中文占两个字节，ascii字符占一个字节
-            }
-            if (command.length > 0) {
-              command = command.substr(0, command.length - 1);
-            }
-          }
+          var cnt = term._core.buffer.x-4;
+          if(cnt<=0 || command.length==0) break;
+          // delete the last unicode char
+          command = command.replace(/.$/u, "");
+          // clear the whole line
+          term.write('\b \b'.repeat(cnt));
+          // re-write the command
+          term.write(command);
           break;
         default: // Print all other characters for demo
           if (e >= String.fromCharCode(0x20) && e <= String.fromCharCode(0x7E) || e >= '\u00a0') {