ScrollView 组件参考

[t99t99t99]

URL : https://github.com/cocos-creator/creator-docs/blob/master/zh/ui-system/components/editor/scrollview.md

[MrKylinGithub]

未知问题，请描述具体问题再开启此issue。谢谢反馈！

[t99t99t99]

filePath: zh/ui-system/components/editor/scrollview.md
callback(scrollview, eventType, customEventData){} eventType是数字，不是字符串

得先定义let ScrollViewEventMap = [
"scroll-to-top",
"scroll-to-bottom",
"scroll-to-left",
"scroll-to-right",
"scrolling",
"bounce-top",
"bounce-bottom",
"bounce-left",
"bounce-right",
"scroll-ended",
"touch-up",
"scroll-ended-with-threshold",
"scroll-began",
]

ScrollViewEventMap[eventType] = ScrollView.EventType.xxx