# Sheet Reactive
By registering a listener function, to achieve js - based self - corresponding function.
import {watchEffect} from "lazycss-base"
let style = useStyle({
demo: {
width: 330,
fontSize: 16
}
})
useEffect("demo.width", (oldValue, latestValue) => {
// ... your code
})
useEffect("demo.fontSize", (oldValue, latestValue) => {
// ... your code
})
//this function can listen all properties
//and you can use global default value to listen client width and height
useEffect("globalClientResize", (width, height) => {
// ... your code
})
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