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Prototype实战教程 1.$$

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<title>Test $$</title>
<script src="prototype.js"></script>
function test$$(){
   in case CSS is not your forte, the expression below says
   'find all the INPUT elements that are inside
   elements with class=field that are inside a DIV
   with id equal to loginForm.'
  var f = $$('div#loginForm .field input');
  var s = '';
  for(var i=0; i<f.length; i++){
    s += f[i].value + '/';
  alert(s); // shows: "joedoe1/secret/"
  //now passing more than one expression
  f = $$('div#loginForm .field input', 'div#loginForm .fieldName');
  s = '';
  for(var i=0; i<f.length; i++){
    s += ( f[i].value ? f[i].value : f[i].innerHTML ) + '/';
  alert(s); //shows: "joedoe1/secret/User name:/Password:/"
var  temp=$$('div#loginForm .field');
function testtoColorPart()
{var num=new Number(50);


<div id='loginForm'>
  <div class='field'>
    <span class='fieldName'>User name:</span>
    <input type='text' id='txtName' value='joedoe1'/>
  <div class='field'>
    <span class='fieldName'>Password:</span>
    <input type='password' id='txtPass' value='secret' />
  <input type='submit' value='login' />
<input type=button value='test $$()' onclick='test$$();' />
<input type=button value='testtoColorPart' onclick='testtoColorPart();' />