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			210 lines
		
	
	
		
			6.2 KiB
		
	
	
	
		
			Vue
		
	
	
	
	
	
			
		
		
	
	
			210 lines
		
	
	
		
			6.2 KiB
		
	
	
	
		
			Vue
		
	
	
	
	
	
<template>
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	<!-- #ifndef APP-NVUE -->
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	<view
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	    class="u-grid-item"
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	    hover-class="u-grid-item--hover-class"
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	    :hover-stay-time="200"
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	    @tap="clickHandler"
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	    :class="classes"
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	    :style="[itemStyle]"
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	>
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		<slot />
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	</view>
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	<!-- #endif -->
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	<!-- #ifdef APP-NVUE -->
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	<view
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	    class="u-grid-item"
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	    :hover-stay-time="200"
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	    @tap="clickHandler"
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	    :class="classes"
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	    :style="[itemStyle]"
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	>
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		<slot />
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	</view>
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	<!-- #endif -->
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</template>
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<script>
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	import props from './props.js';
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	/**
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	 * gridItem 提示
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	 * @description 宫格组件一般用于同时展示多个同类项目的场景,可以给宫格的项目设置徽标组件(badge),或者图标等,也可以扩展为左右滑动的轮播形式。搭配u-grid使用
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	 * @tutorial https://www.uviewui.com/components/grid.html
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	 * @property {String | Number}	name		宫格的name ( 默认 null )
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	 * @property {String}			bgColor		宫格的背景颜色 (默认 'transparent' )
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	 * @property {Object}			customStyle	自定义样式,对象形式
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	 * @event {Function} click 点击宫格触发
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	 * @example <u-grid-item></u-grid-item>
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	 */
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	export default {
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		name: "u-grid-item",
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		mixins: [uni.$u.mpMixin, uni.$u.mixin,props],
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		data() {
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			return {
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				parentData: {
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					col: 3, // 父组件划分的宫格数
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					border: true, // 是否显示边框,根据父组件决定
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				},
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				// #ifdef APP-NVUE
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				width: 0, // nvue下才这么计算,vue下放到computed中,否则会因为延时造成闪烁
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				// #endif
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				classes: [], // 类名集合,用于判断是否显示右边和下边框
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			};
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		},
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		mounted() {
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			this.init()
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		},
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		computed: {
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			// #ifndef APP-NVUE
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			// vue下放到computed中,否则会因为延时造成闪烁
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			width() {
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				return 100 / Number(this.parentData.col) + '%'
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			},
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			// #endif
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			itemStyle() {
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				const style = {
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					background: this.bgColor,
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					width: this.width
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				}
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				return uni.$u.deepMerge(style, uni.$u.addStyle(this.customStyle))
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			}
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		},
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		methods: {
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			init() {
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				// 用于在父组件u-grid的children中被添加入子组件时,
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				// 重新计算item的边框
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				uni.$on('$uGridItem', () => {
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					this.gridItemClasses()
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				})
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				// 父组件的实例
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				this.updateParentData()
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				// #ifdef APP-NVUE
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				// 获取元素该有的长度,nvue下要延时才准确
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				this.$nextTick(function(){
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					this.getItemWidth()
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				})
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				// #endif
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				// 发出事件,通知所有的grid-item都重新计算自己的边框
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				uni.$emit('$uGridItem')
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				this.gridItemClasses()
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			},
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			// 获取父组件的参数
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			updateParentData() {
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				// 此方法写在mixin中
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				this.getParentData('u-grid');
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			},
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			clickHandler() {
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				let name = this.name
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				// 如果没有设置name属性,历遍父组件的children数组,判断当前的元素是否和本实例this相等,找出当前组件的索引
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				const children = this.parent?.children
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				if(children && this.name === null) {
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					name = children.findIndex(child => child === this)
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				}
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				// 调用父组件方法,发出事件
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				this.parent && this.parent.childClick(name)
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				this.$emit('click', name)
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			},
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			async getItemWidth() {
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				// 如果是nvue,不能使用百分比,只能使用固定宽度
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				let width = 0
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				if(this.parent) {
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					// 获取父组件宽度后,除以栅格数,得出每个item的宽度
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					const parentWidth = await this.getParentWidth()
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					width = parentWidth / Number(this.parentData.col) + 'px'
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				}
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				this.width = width
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			},
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			// 获取父元素的尺寸
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			getParentWidth() {
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				// #ifdef APP-NVUE
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				// 返回一个promise,让调用者可以用await同步获取
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				const dom = uni.requireNativePlugin('dom')
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				return new Promise(resolve => {
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					// 调用父组件的ref
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					dom.getComponentRect(this.parent.$refs['u-grid'], res => {
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						resolve(res.size.width)
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					})
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				})
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				// #endif
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			},
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			gridItemClasses() {
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				if(this.parentData.border) {
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					const classes = []
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					this.parent.children.map((child, index) =>{
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						if(this === child) {
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							const len = this.parent.children.length
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							// 贴近右边屏幕边沿的child,并且最后一个(比如只有横向2个的时候),无需右边框
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							if((index + 1) % this.parentData.col !== 0 && index + 1 !== len) {
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								classes.push('u-border-right')
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							}
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							// 总的宫格数量对列数取余的值
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							// 如果取余后,值为0,则意味着要将最后一排的宫格,都不需要下边框
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							const lessNum = len % this.parentData.col === 0 ? this.parentData.col : len % this.parentData.col
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							// 最下面的一排child,无需下边框
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							if(index < len - lessNum) {
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								classes.push('u-border-bottom')
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							}
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						}
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					})
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					// 支付宝,头条小程序无法动态绑定一个数组类名,否则解析出来的结果会带有",",而导致失效
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					// #ifdef MP-ALIPAY || MP-TOUTIAO
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					classes = classes.join(' ')
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					// #endif
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					this.classes = classes
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				}
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			}
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		},
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		beforeDestroy() {
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			// 移除事件监听,释放性能
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			uni.$off('$uGridItem')
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		}
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	};
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</script>
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<style lang="scss" scoped>
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	@import "../../libs/css/components.scss";
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      $u-grid-item-hover-class-opcatiy:.5 !default;
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      $u-grid-item-margin-top:1rpx !default;
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      $u-grid-item-border-right-width:0.5px !default;
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      $u-grid-item-border-bottom-width:0.5px !default;
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      $u-grid-item-border-right-color:$u-border-color !default;
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      $u-grid-item-border-bottom-color:$u-border-color !default;
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	.u-grid-item {
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		align-items: center;
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		justify-content: center;
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		position: relative;
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		flex-direction: column;
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		/* #ifndef APP-NVUE */
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		box-sizing: border-box;
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		display: flex;
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		/* #endif */
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		/* #ifdef MP */
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		position: relative;
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		float: left;
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		/* #endif */
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		/* #ifdef MP-WEIXIN */
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		margin-top:$u-grid-item-margin-top;
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		/* #endif */
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		&--hover-class {
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			opacity:$u-grid-item-hover-class-opcatiy;
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		}
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	}
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	/* #ifdef APP-NVUE */
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	// 由于nvue不支持组件内引入app.vue中再引入的样式,所以需要写在这里
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	.u-border-right {
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		border-right-width:$u-grid-item-border-right-width;
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		border-color: $u-grid-item-border-right-color;
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	}
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	.u-border-bottom {
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		border-bottom-width:$u-grid-item-border-bottom-width;
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		border-color:$u-grid-item-border-bottom-color;
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	}
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	/* #endif */
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</style>
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