输入中文文字，按“转化”，即可将其转化为unicode字符

unicode_change.js

var mode="zhuan";
function encode(obj,btn){
if(mode=="zhuan"){
   obj.value=obj.value.replace(/[^\u0000-\u00FF]/g,function($0){return escape($0).replace(/(%u)(\w{4})/gi,"\\u$2")});
   btn.value="还原";
   mode="huan";
}else{
   obj.value=unescape(obj.value.replace(/\\u/g,'%u').replace(/;/g,''));
   btn.value="转化";
   mode="zhuan";
}
}
function convert2Unicode(char) {
  return "\\u" + char.charCodeAt(0).toString(16);
}
function toUnicode(theString) {
  var unicodeString = '';
  for (var i = 0; i < theString.length; i++) {
    var theUnicode = theString.charCodeAt(i).toString(16).toUpperCase();
    while (theUnicode.length < 4) {
      theUnicode = '0' + theUnicode;
    }
    theUnicode = '\\u' + theUnicode;
    unicodeString += theUnicode;
  }
  return unicodeString;
}