火狐浏览器 和 ie浏览器的event获得 和 阻止 方式不同

app/views/forums/edit.html.erb

@@ -1,23 +1,7 @@
 
 <%= javascript_include_tag "/assets/kindeditor/kindeditor",'/assets/kindeditor/pasteimg' ,'new_user' %>
 <script>
-    $(function(){
-        document.getElementById('forum_name').onkeydown = function()
-        {
-            var n = 0;
-            var str = this.value;
-            for (i = 0; i < str.length; i++) {
-                var leg = str.charCodeAt(i);//ASCII码
-                if (leg > 255) {
-                    n += 2;
-                } else {
-                    n += 1;
-                }
-            }
-            if(n >= 160 && event.keyCode != 8)
-                event.returnValue = false;
-        }
-    })
+
 
     function check_and_submit(doc){
         $("#error").html('').hide();
@@ -66,4 +50,29 @@
     autoTextarea(textarea);
     var textarea1 = document.getElementById('forum_desc');
     autoTextarea(textarea1);
+    $(function(){
+        $('#forum_name').keypress(function(e)
+        {
+            var n = 0;
+            var str = this.value;
+            for (i = 0; i < str.length; i++) {
+                var leg = str.charCodeAt(i);//ASCII码
+                if (leg > 255) {
+                    n += 2;
+                } else {
+                    n += 1;
+                }
+            }
+            if(n >= 160 && e.keyCode != 8)
+                if(document.all)
+                {
+                    e.returnValue = false;
+                }
+                else
+                {
+                    e.preventDefault();
+                }
+
+        })
+    })
 </script>

app/views/forums/index.html.erb

@@ -49,7 +49,7 @@
           $("#reorder_popu").removeClass("sortArrowActiveD");
           add_class("reorder_time");
       });
-      document.getElementById('forum_name').onkeydown = function()
+      $('#forum_name').keypress( function(e)
       {
           var n = 0;
           var str = this.value;
@@ -61,9 +61,16 @@
                   n += 1;//英文，不多说了
               }
           }
-          if(n >= 160 && event.keyCode != 8)
-              event.returnValue = false;
-      }
+          if(n >= 160 && e.keyCode != 8)
+              if(document.all)
+              {
+                  e.returnValue = false;
+              }
+              else
+              {
+                  e.preventDefault();
+              }
+      })
   });
   function check_and_submit(doc){
       $("#error").html('').hide();

public/javascripts/new_user.js

@@ -337,7 +337,7 @@ var autoTextarea = function (elem, extra, maxHeight) {
 };
 
 function limitStrsize(id,length){
-    document.getElementById(id).onkeydown = function()
+    $('#'+id).keypress(function(e)
     {
         var n = 0;
         var str = this.value;
@@ -350,9 +350,16 @@ function limitStrsize(id,length){
             }
         }
 
-        if(n >= length && event.keyCode !== 8)
-            event.returnValue = false;
-    }
+        if(n >= length && e.keyCode !== 8)
+            if(document.all)
+            {
+                e.returnValue = false;
+            }
+            else
+            {
+                e.preventDefault();
+            }
+    })
 }
 
 /////////////////////////////////////////////////////////////////////////////////////创建项目