jQuery commonly used API
1: jQuery selector
$("Selector") // Write the CSS selector directly in the selector, but add quotation marks
| Attributes | description | use |
|---|---|---|
| ID selector | Get the element with the specified ID | $("#id") |
| Select all selector | Match all elements | $("*’’) |
| Class selector | Get elements of the same class | $(".class") |
| Label selector | Get all elements of the same type of label | $(“div”) |
| Union selector | Select multiple elements | s(“div,p,li”) |
| Intersection selector | Intersection element | $(“Ii.current”) |
| Child selector | Use the> sign to get the parent-child level elements; note that the grandchildren level elements will not be obtained | $(“ul>li”); |
| Descendant selector | Use spaces to represent descendant selectors to get all li elements under ul, including grandchildren, etc. | $(“ul li”); |
2: jQuery implicit iteration
The process of traversing internal DOM elements (stored in pseudo-array form) is called implicit iteration.
jQuery style cannot use style
jQuery style settings:
$('div').css('属性','值');
3: jQuery filter selector
| Attributes | use | description |
|---|---|---|
| :first | $("li:first’) | Get the first li element |
| :last | $("li:last’) | Get the last li element |
| :eq(index) | $(“li:eq(2)”) | Among the obtained li elements, the element with index number 2 is selected, and the index number index starts from 0. |
| :odd | $(“Ii:odd”) | Among the obtained li elements, select the element with an odd index number |
| :even | $(“Ii:even”) | Among the obtained li elements, select the element with an even index number |
4: jQuery filtering method
| Attributes | use | description |
|---|---|---|
| parent() | $(“li”).parent(); | Find parent |
| children(selector) | $(“ul” ).children(“li”) | Equivalent to $("ul>li"), the nearest level (pro son) |
| find(selector) | $(“ul” ).find(“li”); | Equivalent to $("ul li"), descendant selector |
| siblings(selector) | $( “.first” ). siblings(“li”); | Find sibling nodes, not including yourself |
| nextAll([expr]) | $(".first"). nextAl1() | Find all sibling elements after the current element |
| prevtAll ([expr]) | $(".last") . prevAll() | Find all sibling elements before the current element |
| hasClass(class) | $( 'div ’ ).hasClass(“protected”) | Check whether the current element contains a particular class, if so, return true |
| eq(index) | $ (“Li”). Ea (2); | Equivalent to $("li:eq(2)"), index starts from 0 |
[Talking]
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suddenly found that the font may be changed
merrychristmas. Merry christmas.merrychristmas.
merry christmas
<body>
<div class="test"></div>
<div></div>
</body>
<script>
var flag = $('div:first').hasClass('test');
console.log(flag);
//结果返回true
</script>
5: jQuery's exclusive thought
<script>
//先全局函数
$(function () {
//点击li，让li添加底下内容
// 1：变化li的背景色
$(".tab_list li").click(function () {
$(this).addClass('current').siblings().removeClass('current');
// 2：变化底下的内容
// 获取被点击li的索引号
var index = $(this).index();
$(".tab_con .item").eq(index).show().siblings().hide();
})
})
</script>