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>