jquery中的css方法和事件方法用法详解

CSS方法

.hasClass(calssName) 检查元素是否包含某个class，返回true/false

$( "#mydiv" ).hasClass( "foo" )

.addClass(className) / .addClass(function(index,currentClass)) 为元素添加class，不是覆盖原class，是追加，也不会检查重复

$( "p" ).addClass( "myClass yourClass" );
$( "ul li" ).addClass(function( index ) {  return "item-" + index;
});

removeClass([className]) / ,removeClass(function(index,class)) 移除元素单个/多个/所有class

$( "p" ).removeClass( "myClass yourClass" );
$( "li:last" ).removeClass(function() {  return $( this ).prev().attr( "class" );
});

.toggleClass(className) /.toggleClass(className,switch) / .toggleClass([switch]) / .toggleClass( function(index, class, switch) [, switch ] ) toggle是切换的意思，方法用于切换，switch是个bool类型值，这个看例子就明白

<div class="tumble">Some text.</div>

第一次执行

$( "div.tumble" ).toggleClass( "bounce" )
<div class="tumble bounce">Some text.</div>

第二次执行

$( "div.tumble" ).toggleClass( "bounce" )
<div class="tumble">Some text.</div>

$( "#foo" ).toggleClass( className, addOrRemove );// 两种写法意思一样if ( addOrRemove ) {
  $( "#foo" ).addClass( className );
} else {
  $( "#foo" ).removeClass( className );
}

$( "div.foo" ).toggleClass(function() {  if ( $( this ).parent().is( ".bar" ) ) {    return "happy";
  } else {    return "sad";
  }
});

.css(propertyName) / .css(propertyNames) 获取元素style特定property的值

var color = $( this ).css( "background-color" ); 
var styleProps = $( this ).css([    "width", "height", "color", "background-color"
  ]);

.css(propertyName,value) / .css( propertyName, function(index, value) ) / .css( propertiesJson ) 设置元素style特定property的值

$( "div.example" ).css( "width", function( index ) {  return index * 50;
});
$( this ).css( "width", "+=200" );
$( this ).css( "background-color", "yellow" );
   $( this ).css({      "background-color": "yellow",      "font-weight": "bolder"
    });

事件方法

.bind( eventType [, eventData ], handler(eventObject) ) 绑定事件处理程序，这个经常用，不多解释

$( "#foo" ).bind( "click", function() {
  alert( "User clicked on 'foo.'" );
});

.delegate( selector, eventType, handler(eventObject) ) 这个看官方解释吧

Attach a handler to one or more events for all elements that match the selector, now or in the future, based on a specific set of root elements.

$( "table" ).on( "click", "td", function() {//这样把td的click事件处理程序绑在table上
  $( this ).toggleClass( "chosen" );
});

.on( events [, selector ] [, data ], handler(eventObject) ) 1.7后推荐使用，取代bind、live、delegate

$( "#dataTable tbody" ).on( "click", "tr", function() {
  alert( $( this ).text() );
});

.trigger( eventType [, extraParameters ] ) JavaScript出发元素绑定事件

$( "#foo" ).trigger( "click" );

.toggle( [duration ] [, complete ] ) / .toggle( options ) 隐藏或显示元素

$( ".target" ).toggle();
$( "#clickme" ).click(function() {
  $( "#book" ).toggle( "slow", function() {    // Animation complete.  });
});

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