What is the vue component? Components are reusable Vue instances. It is essentially an object that contains member attributes such as data, computed, watch, methods, filters, and vue component life cycle hooks. This article will give you a detailed introduction to the content of the vue component.
Let’s take a look at the component structure first:
The data attribute maintains the internal state of a component, and other components are not visible under normal circumstances.
Currently I don’t know how to monitor its changes;
Because the calculated attribute computed and the listening attribute watch can only monitor changes in responsive dependencies, and $refs is not responsive.
Can be passed to child components through props;
Can be passed to parent components through $emit;
Can be passed to this.$refs.ref.$data in mounted Get the internal state of the child component during the life cycle;
The data option of a component must be a function.
Use the maximum programming capabilities of JavaScript. This function receives a createElement method as the first parameter Used to create VNode; createElement receives three parameters: component root node type, component configuration object, child node (official description of component configuration object); Example:
{
render: function (createElement) {
return createElement(
'h' + this.level, // tag name 标签名称
this.$slots.default // 子组件中的阵列
)
},
props: {
level: {
type: Number,
required: true
}
}
}
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vue single file component
Single file component structurally separates templates, logic, and styles and saves them in the same file.
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