xml has three most basic selectors: "element selector", "class selector" and "ID selector": 1. Element selector, the most basic selector, matches elements by element name ; 2. Class selector, matching elements by class name, the format is to add a dot "." before the class name; 3. ID selector, matching elements by ID, the format is adding a pound sign "#" before the ID .
# Operating system for this tutorial: Windows 10 system, Dell G3 computer.
There are the following selectors in XML:
- Element selector: This is the most basic selector, matching elements by element name. For example,
is an element selector that selects the element named "productame". - Class selector: Match elements by class name. The format of a class selector is to precede the class name with a dot (.). For example, .className is a class selector that selects elements with the class name "className".
- ID selector: matches elements by ID. The format of the ID selector is to add a pound sign (#) before the ID. For example, #IDName is an ID selector that selects elements with the ID "IDName".
In addition to the above three basic selectors, there are other more complex selectors:
- Descendant selectors: You can select the child elements of a specific element. For example, div p will select all p elements inside a div element.
- Child element selector: You can select the direct child elements of a specific element. For example, div > p will select all p elements that are direct children of div elements.
- Adjacent sibling selector: You can select the next or previous sibling element of a specific element. For example, h1 p will select all p elements immediately following the h1 element.
- Attribute selector: You can select elements with specific attributes. For example, input[type="text"] will select all input elements of type "text".
Here is an example showing how to use these selectors:
<root> <productame>This is a product</productame> <price>100</price> <productame>Another product</productame> </root>
In this example, these elements can be styled using the following CSS rules:
/* 使用元素选择器 */ productame { font-size: 20pt; } /* 使用类选择器 */ .red { color: red; } .blue { color: blue; } /* 使用ID选择器 */ #price { color: green; }
In this CSS, the productame selector sets all
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