The difference between css() and attr() methods in jQuery

This article mainly introduces the difference between the css() and attr() methods in jQuery. It has certain reference value. Now I share it with you. Friends in need can refer to the

method introduction:

css():

html code:

<p class="box" id="box" style="width: 300px;height: 100px;background-color: yellow"></p>

jQuery code:

<script type="text/javascript">
    var oBox = $("#box");
    // 只有一个参数时,是获取对应样式的值
    console.log($("#box").css("width"));// 返回300px

    // 两个参数时,是设置对应的样式属性
    oBox.css("width", "400");
    console.log($("#box").css("width"));// 返回400px
    // 也支持对象形式进行设置样式
    oBox.css({
        "width": 500,
        "height": "500px",
        "background-color": "yellow"
    });
</script>

attr():

html code:

<p class="box" id="box" style="width: 300px;height: 100px;background-color: yellow"></p>

jQuery code:

<script type="text/javascript">
    var oBox = $("#box");
    var oImg = $("#pic");
    // 一个参数为读取对应的属性，属性的都可以读取，包括style
    console.log(oImg.attr("id"));// 返回pic
    console.log(oImg.attr("src"));// 返回images/0.jpg

    // 设置p(oBox)上面的width属性为400
    console.log(oBox.attr("width", "400"));
    // 假如是一个不存在的属性，使用这个代码，就会添加这个属性到匹配到的元素上面 ，如oBox.attr("data-width","100px");,使用这个，oBox的Html元素上面就会新增一个data-width的属性 
</script>

attr() can also set the style style:

html Code:

<p class="box" id="box" style="width: 300px;height: 100px;background-color: yellow"></p>

jQuery Code:

<script type="text/javascript">
    var oBox = $("#box");
    //这里有一个重置了行内的style样式的现象，background-color不再有效
    oBox.attr("style", "width: 310px;height: 110px");
</script>

Summary:

• ##css()The method is to obtain/modify The method of style attributes (related to style);

• attr() is the method to get/modify the attributes of elements (related to Html tags);

• attr() and css() operate on style both for inline styles.

• style is also an attribute of the element,

  attr() can also be operated on it, so functionally css() can be regarded as Is a subset of attr().

• attr()The operation returns string, and the css() operation returns object.

Extension:

prop() method is a method to obtain/modify the element’s own attributes, excluding custom ones Attributes. html code:

<p></p>

jQuery code: <p></p>

<script>
    var oBox = $("#box");
    console.log(oBox.prop("style"));// 返回的是所有style的属性和值 包括已经设置的和未设置的
</script>

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