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jQuery之元素的遍历与元素的过滤

2015-09-26 00:02 633 查看

1. 遍历：向下，向上，同级遍历

1. 向下：

<style>

#div1{
width: 500px;
height: 200px;
border: 3px solid chocolate;
}
#div2{
width: 400px;
height: 150px;
margin-top: 10px;
margin-left: 10px;
border: 3px solid chocolate;
}
p{
margin-left: 10px;
margin-top: 10px;
width: 150px;
height: 80px;
border: 3px solid chocolate;
}

</style>

<div id="div1">div1
<div id="div2">div2
<p>
<a>
hello world
</a>
</p>
</div>
</div>

$(document).ready(function(){
$("#div1").children("#div2").css({border: "3px solid black"}); //only to children
//$("#div1").find("p").css({border: "3px solid blue"}); // must have parameter
});

2. 向上

$(document).ready(function(){
//$("a").parent().css({border: "3px solid black"}); //1. yibu
//$("a").parents().css({border: "3px solid black"}); //2. quanbu
$("a").parentsUntil("#div1").css({border: "3px solid black"}) //3. zhi
});

3. 同级

<style>
.bd *{
display: block;
border: 3px solid gray;
color: gray;
padding: 5px;
margin: 15px;
}
</style>
</head>
<body>
<div class="bd">
<p>P</p>
<h2>H2</h2>
<h3>H3</h3>
<h4>H4</h4>
<h5>H5</h5>
<h6>H6</h6>
</div>
</body>

// sibings()
// next() nextAll() nextUntil()
// prev() preAll() preUntil()
$(document).ready(function(){
//$("h4").siblings().css({border: "3px solid green"});
$("h4").next().css({border: "3px solid green"});
});

3. 过滤

<div>
<p>div1</p>
</div>
<div>
<p class="pclass">div2</p>
</div>
<div>
<p class="pclass">div3</p>
</div>
<div>
<p>div4</p>
</div>

// first() last() eq() filter() not()

$(document).ready(function(){
// $("div p").first().css("background-color","red");
// $("div p").last().css("background-color","green");
// $("div p").eq(1).css("background-color","blue");
$("div p").filter(".pclass").css("background-color","aqua");
//$("div p").not(".pclass").css("background-color","yellow");
});

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