function hiddenPass(event) {  var password0 = document.getElementById("password0");  var password1 = document.getElementById("password1");  if (event.keyCode == 13) {  }  var keycode;  if (window.event) { // IE    keycode = event.keyCode  } else if (event.which) { // Netscape/Firefox/Opera    keycode = event.which  }  var keychar = String.fromCharCode(keycode);  password1.value = password1.value + keychar;  password1.value = password1.value.substring(0, password0.length);}function clearPass(){  $("#password0").val("");  $("#password1").val("");}<li class="ba"><label>密 码：</label>  <input type="text" id="password0"      onfocus="javascript:clearPass();"      onkeyup="this.value=this.value.replace(/./g,'*')"      onkeypress="javascript:hiddenPass(event);"/>  <input type="hidden" id="password1" name="password1"/></li>