uniapp 文字超出多少字，显示收起全文按钮效果demo（整理）

<template>
	<view class="font30 color000 mL30 mR30">
		<text :class="showFullText ? '' : 'clamp-text'">{{ text }}</text>
		<view v-if="showToggleBtn && text.length > 42" @click="toggleShowFullText">
			{{ showFullText ? '收起' : '全文' }}
		</view>
	</view>
</template>

<script>
	export default {
		data() {
			return {
				text: '我与春风皆是客，你携秋水揽星河。我与春风皆是客，你携秋水揽星河。我与春风皆是客，你携秋水揽星河。我与春风皆是客我与春风皆是客我与春风皆是客我与春风皆是客我与春风皆是客我与春风皆是客我与春风皆是客我与春风皆是客我与春风皆是客我与春风皆是客我与春风皆是客我与春风皆是客我与春风皆是客我与春风皆是客，你携秋水揽星河。我与春风皆是客。',
				showFullText: false
			};
		},
		computed: {
			showToggleBtn() {
				return this.text.length > 42;
			}
		},
		methods: {
			toggleShowFullText() {
				this.showFullText = !this.showFullText;
			}
		}
	};
</script>

<style>
	.clamp-text {
		display: -webkit-box;
		-webkit-box-orient: vertical;
		-webkit-line-clamp: 2;
		overflow: hidden;
		text-overflow: ellipsis;
	}

	view {
		color: #007aff;
	}
</style>