const { ccclass , property } = cc . _decorator ; @ ccclass export default class CanvasAdapt extends cc . Component { protected onLoad ( ) { this . adapt ( ) ; cc . view . setResizeCallback ( ( ) => { this . adapt ( ) ; } ) ; } private adapt ( ) { let resolutionRatio = cc . Canvas . instance . designResolution . width / cc . Canvas . instance . designResolution . height ; let ratio = cc . winSize . width / cc . winSize . height ; if ( ratio > resolutionRatio ) { cc . Canvas . instance . fitHeight = true ; cc . Canvas . instance . fitWidth = false ; } else { cc . Canvas . instance . fitHeight = false ; cc . Canvas . instance . fitWidth = true ; } } }