$('h2').css({
  color: 'blue',
  backgroundColor: 'gray',
  fontSize: '24px'
});

jQuery 添加类

$('.button').addClass('active'); 

jQuery 删除类

$('.button').on('mouseleave', evt => {
   let e = evt.currentTarget;
   $(e).removeClass('active');
});

jQuery .toggleClass

$('.choice').toggleClass('highlighted');

/*<span>Span.</span>*/
$('span').after('<p>Paragraph.</p>');
/*<span>Span.</span><p>Paragraph.</p>*/

/*<span>Span.</span>*/
$('<span>Span.</span>').replaceAll('p');
/*<p>Span.</p>*/

/*<span>This is span.</span>*/
$('span').wrap('<p></p>');
/*<p><span>This is span.</span></p>*/

// A mouse event 'click'
$('#menu-button').on('click', () => {
  $('#menu').show();
});

// A keyboard event 'keyup'
$('#textbox').on('keyup', () => {
  $('#menu').show();
});

// A scroll event 'scroll'
$('#menu-button').on('scroll', () => {
  $('#menu').show();
});

事件对象

$('#menu').on('click', event => {
  $(event.currentTarget).hide();
});

方法链

$('#menu-btn').on('mouseenter', () => {
  $('#menu').show();
}).on('mouseleave', () => {
  $('#menu').hide();
});

阻止事件

$( "p" ).click(function( event ) {
  event.stopPropagation();
  // Do something
});

$('#menu-button').on('click', () => {
  // $('#menu').fadeIn(400, 'swing')
  $('#menu').fadeIn();
});

淡出效果

$('#menu-button').on('click', () => {
  // $('#menu').fadeOut(400, 'swing')
  $('#menu').fadeOut();
});

$.ajax({
  url: this.action,
  type: this.method,
  data: $(this).serialize()
}).done(function(server_data){
  console.log("success" + server_data);
}).fail(function(jqXHR, status, err){
  console.log("fail" + err);
});