doc/node/fn.find.html

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        <title>$.fn.find</title>
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        <article>
            <h3>$.fn.find( expr )</h3>
            <p>
                <span class="stress">描述：</span>
            </p>
            <p>取得当前匹配节点的所有匹配expr的后代，组成新mass实例返回。</p>
            <p>
                <span class="stress">参数：</span>
            </p>
            <dl>
                <dt>expr</dt>
                <dd>必需。String。CSS表达式。</dd>
            </dl>
            <p>
                <span class="stress">返回值：</span>
            </p>
            <p>新的mass实例</p>
            <fieldset>
                <legend>例子</legend>
                <p>搜索.sample1所有后代的span元素，和效果与$(".sample1 span")一样</p>
                <div class="sample1">
                    <p>
                        <span>Hello</span>, how are you?</p>
                    <p>Me? I'm
                        <span>good</span>.</p>
                </div>
                <pre class="brush:xml;gutter:false;toolbar:false">

    <div class="sample1">
        <p><span>Hello</span>, how are you?</p>
        <p>Me? I'm <span>good</span>.</p>
    </div>
    
</pre>
                <pre class="brush:javascript;gutter:false;toolbar:false">
$.require("ready,css", function() {
    $(".sample1").find("span").css("color", "red")
});
</pre>
                <button class="doc_btn" type="button">点我，执行代码</button>
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