js文本框禁止输入表情

js在用户输入表情时自动过滤掉，显示和无法输入表情效果一样

<input type="text" id="input" maxlength="10"/>

$('#input').keyup(function(){

noEmoji($(this));
        })

var noEmoji = function(dom) {   var html = "",      oldHtml = "";   if('INPUT' == dom.tagName) {      html = $(dom).val();   }    oldHtml = html;   var reg = /[^\u0020-\u007E\u00A0-\u00BE\u2E80-\uA4CF\uF900-\uFAFF\uFE30-\uFE4F\uFF00-\uFFEF\u0080-\u009F\u2000-\u201f\u2026\u2022\u20ac\r\n]/g;   if(html.match(reg)) {      html = html.replace(reg, '');   }   if(html != oldHtml) {      if('INPUT' == dom.tagName) {         $(dom).val(html);      }    }   /**    * 光标移到最后    */   function endFocus(dom) {      var sel = window.getSelection();      var range = document.createRange();      range.selectNodeContents(dom);      range.collapse(false);      sel.removeAllRanges();      sel.addRange(range);   }};