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# 在props中处理生命周期函数 |
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在[组件生命周期](http://fanruan.design/doc.html?post=244ba71889)一文中,详细解释了组件中各个生命周期钩子的执行时机.那么是不是我们想要使用生命周期钩子,就一定要写一个组件类呢?答案是否定的. |
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类似于[9、高阶组件的render-props](https://code.fanruan.com/dailer/FineUI-100-Questions/src/branch/master/questions/4.高阶组件的render-props.md)文中所讲,render可以通过props指定,那么beforeRender,mounted等其他生命周期函数可否通过props控制呢? 如果和类组件中方法产生冲突,又是如何处理的呢? |
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FineUI中有两种处理方式直接覆盖和一并执行 |
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直接覆盖的有: beforeInit,beforeRender,render. 如果在props中指定了相应生命周期钩子,则组件类内的方法不会执行 |
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一并执行的有: beforeCreate,created,beforeMount,mounted,beforeDestroy,destroyed,beforeUpdate,updated,如果在props中指定了相应生命周期钩子,则按照先执行类方法,再执行props中方法的顺序依次执行 |
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如下示例,最终的输出会是什么呢? |
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```demo |
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const logs = []; |
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const Menus = BI.inherit(BI.Widget, { |
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beforeRender: function () { |
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logs.push("内部的beforeRender"); |
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return Promise.resolve(); |
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}, |
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render: function () { |
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logs.push("内部的render"); |
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return { |
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type: "bi.button", |
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text: "内部的render", |
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}; |
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}, |
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beforeMount: function () { |
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logs.push("内部的beforeMount"); |
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}, |
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mounted: function () { |
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logs.push("内部的beforeMount"); |
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}, |
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setText: function (text) { |
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this.button.setText(text); |
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}, |
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}); |
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BI.shortcut("demo.menus", Menus); |
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const Widget10 = BI.createWidget({ |
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type: "bi.vertical", |
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items: [ |
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{ |
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el: { |
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type: "demo.menus", |
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beforeRender: () => { |
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logs.push("外面的beforeRender"); |
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return Promise.resolve(); |
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}, |
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render: function () { |
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logs.push("外面的render"); |
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return { |
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type: "bi.label", |
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ref: (_ref) => { |
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this.button = _ref; |
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}, |
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text: "外面的render", |
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whiteSpace: "normal", |
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}; |
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}, |
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beforeMount: () => { |
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logs.push("外面的beforeMount"); |
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}, |
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mounted: function () { |
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logs.push("外面的mounted"); |
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this.setText(logs.join("\n")); |
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}, |
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}, |
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}, |
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], |
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}); |
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``` |
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