//仅选择JavaScript
selected = $("#para-1");
//仅选择Erlang
selected = $(".color-red.color-green");
//选择JavaScript和Erlang
selected = $(".color-red");
//选择所有编程语言
selected = $('[class^=color-]');
//选择名字input
selected = $('input[name="name"]');
//选择邮件和名字input
selected = $('input[name="name"],[name="email"]');