SOURCE

var selected = [];
selected[0] = $("#para-1");
selected[1] = $('.color-red.color-green');
selected[2] = $('.color-red');
selected[3] = $('p');
selected[4] = $('input[name=name]');
selected[5] = $('input[name=name][name=email]');

console.log(selected);

console.log('=============');

myName = 'Chris';

function logName() {
  console.log(myName);
}

logName();

document.querySelector('html').onclick = function() {
    alert('别戳我，我怕疼。');
}

<div id="test-jquery">
    <p id="para-1" class="color-red">JavaScript</p>
    <p id="para-2" class="color-green">Haskell</p>
    <p class="color-red color-green">Erlang</p>
    <p name="name" class="color-black">Python</p>
    <form class="test-form" target="_blank" action="#0" onsubmit="return false;">
        <legend>注册新用户</legend>
        <fieldset>
            <p><label>名字: <input name="name"></label></p>
            <p><label>邮件: <input name="email"></label></p>
            <p><label>口令: <input name="password" type="password"></label></p>
            <p><button type="submit">注册</button></p>
        </fieldset>
    </form>
    <input type="text" disabled></input>
</div>

@font-face{
    font-family: 'FontAwesome';
    src:url('https://fonts.font.im/css?family=Open+Sans')
}
p{
    color:darkorchid;
    text-align: center;
    background-color: aquamarine;
    line-height: 12px;
    font-size: 16px;
    letter-spacing: 1px;
    text-shadow: 3px 3px 1px black;
}
html{
    background-color: #00539F;
}
img[src]{
    color: blue;
}