var milkcocoa = new MilkCocoa("https://io-dhxa654wp.mlkcca.com/");
var chatDataStore = milkcocoa.dataStore("chat");
var textArea, board;
window.onload = function(){
  textArea = document.getElementById("msg");
  board = document.getElementById("board");
}

function clickEvent(){
    var text = textArea.value;
    sendText(text);
    textArea.value = "";
}

function sendText(text){
  chatDataStore.push({message : text},function(data){
    console.log("送信完了!");
  });
}

chatDataStore.on("push",function(data){
  addText(data.value.message);
});

function addText(text){
  var msgDom = document.createElement("li");
  msgDom.innerText = text;
  board.appendChild(msgDom);
}
@@ -273,18 +273,16 @@
 vent()%7B%0A
-  
   var te
@@ -302,18 +302,16 @@
 .value;%0A
-  
   sendTe
@@ -324,33 +324,8 @@
 t);%0A
-    textArea.value = %22%22;%0A
 %7D%0A%0Af
@@ -428,16 +428,41 @@
 %E4%BF%A1%E5%AE%8C%E4%BA%86!%22);%0A
+    textArea.value = %22%22;%0A
   %7D);%0A%7D%0A
@@ -621,20 +621,20 @@
 om.inner
-Text
+HTML
  = text;

change innerText into innerHTML