初始化（包含登录模块）

pages/API/intersection-observer/intersection-observer.vue

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+<template>
+	<view>
+		<page-head :title="title"></page-head>
+		<view class="uni-padding-wrap uni-common-mt">
+			<view class="uni-title uni-common-mt">
+				{{appear ? '小球出现' : '小球消失'}}
+			</view>
+			<scroll-view class="scroll-view" scroll-y>
+				<view class="scroll-area">
+					<text class="notice">向下滚动让小球出现</text>
+					<view class="ball"></view>
+				</view>
+			</scroll-view>
+		</view>
+	</view>
+</template>
+<script>
+	let observer = null;
+	export default {
+		data() {
+			return {
+				appear: false,
+				title:'intersectionObserver'
+			}
+		},
+		onReady() {
+			observer = uni.createIntersectionObserver(this);
+			observer.relativeTo('.scroll-view').observe('.ball', (res) => {
+				if (res.intersectionRatio > 0 && !this.appear) {
+					this.appear = true;
+				} else if (!res.intersectionRatio > 0 && this.appear) {
+					this.appear = false;
+				}
+			})
+		},
+		onUnload() {
+			if (observer) {
+				observer.disconnect()
+			}
+		}
+	}
+</script>
+<style>
+	.scroll-view {
+		height: 400rpx;
+		background: #fff;
+		border: 1px solid #ccc;
+		box-sizing: border-box;
+	}
+
+	.scroll-area {
+		height: 1300rpx;
+		display: flex;
+		flex-direction: column;
+		align-items: center;
+	}
+
+	.notice {
+		margin-top: 150rpx;
+		margin: 150rpx 0 400rpx 0;
+	}
+
+	.ball {
+		width: 200rpx;
+		height: 200rpx;
+		background: #4cd964;
+		border-radius: 50%;
+	}
+</style>