企业家居网站建设,兰州网页,同城网站建设,在萍乡谁可以做网站文章目录 知识回顾前言源码分析1. ref2. 购物车案例分析3. 购物车计算、全选 拓展知识数据持久化localStorage 总结 知识回顾
前言 元素上使用 ref属性关联响应式数据#xff0c;获取DOM元素 步骤
● 创建 ref const hRef ref(null)
● 模板中建立关联 h1 re… 文章目录 知识回顾前言源码分析1. ref2. 购物车案例分析3. 购物车计算、全选 拓展知识数据持久化localStorage 总结 知识回顾
前言 元素上使用 ref属性关联响应式数据获取DOM元素 步骤
● 创建 ref const hRef ref(null)
● 模板中建立关联 h1 refhRef我是标题/h1 hRef.value源码分析
1. ref
const inp refnull | HTMLInputElement() const img refnull | HTMLImageElement()
vue
script setup langts
import { onMounted, ref } from vueconst words ref()
const inp refnull | HTMLInputElement()
const img refnull | HTMLImageElement()
onMounted(() {console.log(onMounted)inp.value?.focus()img.valueconsole.log(img.value)console.log(inp.value)
})
/scripttemplatediv classcontainer idappdiv classsearch-containerimg refimg srchttps:// alt /div classsearch-boxinput refinp typetext v-modelwords idinp /button搜索一下/button/div/div/div
/templatestyle
html,
body {height: 100%;
}.search-container {position: absolute;top: 30%;left: 50%;transform: translate(-50%, -50%);text-align: center;
}.search-container .search-box {display: flex;
}.search-container img {margin-bottom: 30px;
}.search-container .search-box input {width: 512px;height: 16px;padding: 12px 16px;font-size: 16px;margin: 0;vertical-align: top;outline: 0;box-shadow: none;border-radius: 10px 0 0 10px;border: 2px solid #c4c7ce;background: #fff;color: #222;overflow: hidden;box-sizing: content-box;-webkit-tap-highlight-color: transparent;
}.search-container .search-box button {cursor: pointer;width: 112px;height: 44px;line-height: 41px;line-height: 42px;background-color: #ad2a27;border-radius: 0 10px 10px 0;font-size: 17px;box-shadow: none;font-weight: 400;border: 0;outline: 0;letter-spacing: normal;color: white;
}body {background: no-repeat center / cover;background-color: #edf0f5;
}
/style
2. 购物车案例分析 列表渲染、购物车增加删除 css .app-container {padding-bottom: 300px;width: 800px;margin: 0 auto;
}
media screen and (max-width: 800px) {.app-container {width: 600px;}
}
.app-container .banner-box {border-radius: 20px;overflow: hidden;margin-bottom: 10px;
}
.app-container .banner-box img {width: 100%;
}
.app-container .nav-box {background: #ddedec;height: 60px;border-radius: 10px;padding-left: 20px;display: flex;align-items: center;
}
.app-container .nav-box .my-nav {display: inline-block;background: #5fca71;border-radius: 5px;width: 90px;height: 35px;color: white;text-align: center;line-height: 35px;margin-right: 10px;
}.breadcrumb {font-size: 16px;color: gray;
}
.table {width: 100%;text-align: left;border-radius: 2px 2px 0 0;border-collapse: separate;border-spacing: 0;
}
.th {color: rgba(0, 0, 0, 0.85);font-weight: 500;text-align: left;background: #fafafa;border-bottom: 1px solid #f0f0f0;transition: background 0.3s ease;
}
.th.num-th {flex: 1.5;
}
.th {text-align: center;
}
.th:nth-child(4),
.th:nth-child(5),
.th:nth-child(6),
.th:nth-child(7) {text-align: center;
}
.th.th-pic {flex: 1.3;
}
.th:nth-child(6) {flex: 1.3;
}.th,
.td {position: relative;padding: 16px 16px;overflow-wrap: break-word;flex: 1;
}
.pick-td {font-size: 14px;
}
.main,
.empty {border: 1px solid #f0f0f0;margin-top: 10px;
}
.tr {display: flex;cursor: pointer;border-bottom: 1px solid #ebeef5;
}
.tr.active {background-color: #f5f7fa;
}
.td {display: flex;justify-content: center;align-items: center;
}.table img {width: 100px;height: 100px;
}button {outline: 0;box-shadow: none;color: #fff;background: #d9363e;border-color: #d9363e;color: #fff;background: #d9363e;border-color: #d9363e;line-height: 1.5715;position: relative;display: inline-block;font-weight: 400;white-space: nowrap;text-align: center;background-image: none;border: 1px solid transparent;box-shadow: 0 2px 0 rgb(0 0 0 / 2%);cursor: pointer;transition: all 0.3s cubic-bezier(0.645, 0.045, 0.355, 1);-webkit-user-select: none;-moz-user-select: none;-ms-user-select: none;user-select: none;touch-action: manipulation;height: 32px;padding: 4px 15px;font-size: 14px;border-radius: 2px;
}
button.pay {background-color: #3f85ed;margin-left: 20px;
}.bottom {height: 60px;display: flex;align-items: center;justify-content: space-between;padding-right: 20px;border: 1px solid #f0f0f0;border-top: none;padding-left: 20px;
}
.right-box {display: flex;align-items: center;
}
.check-all {cursor: pointer;
}
.price {color: hotpink;font-size: 30px;font-weight: 700;
}
.price-box {display: flex;align-items: center;
}
.empty {padding: 20px;text-align: center;font-size: 30px;color: #909399;
}
.my-input-number {display: flex;
}
.my-input-number button {height: 40px;color: #333;border: 1px solid #dcdfe6;background-color: #f5f7fa;
}
.my-input-number button:disabled {cursor: not-allowed!important;
}
.my-input-number .my-input__inner {height: 40px;width: 50px;padding: 0;border: none;border-top: 1px solid #dcdfe6;border-bottom: 1px solid #dcdfe6;
}vue
script setup langts
import { ref } from vue// 定义水果对象的类型
interface Fruit {id: numbericon: stringisChecked: booleannum: numberprice: number
}// 水果列表
const fruitList refFruit[]([{id: 1,icon: https://hongm-1312445828.cos.ap-nanjing.myqcloud.com/ll.png,isChecked: true,num: 2,price: 6},{id: 2,icon: https://hongm-1312445828.cos.ap-nanjing.myqcloud.com/smt.png,isChecked: false,num: 7,price: 20},{id: 3,icon: https://hongm-1312445828.cos.ap-nanjing.myqcloud.com/tg.png,isChecked: false,num: 3,price: 40},{id: 4,icon: https://hongm-1312445828.cos.ap-nanjing.myqcloud.com/xg.png,isChecked: false,num: 10,price: 3},{id: 5,icon: https://hongm-1312445828.cos.ap-nanjing.myqcloud.com/yl.png,isChecked: false,num: 20,price: 34}
])// 删除商品
const delGoods (id: number) {fruitList.value fruitList.value.filter((item) item.id ! id)
}
// 添加
const addGoods (id: number) {const fruit fruitList.value.find((item) item.id id)fruit fruit.num
}
// 减少
const subGoods (id: number) {const fruit fruitList.value.find((item) item.id id)fruit fruit.num--
}
/scripttemplatediv classapp-container idapp!-- 顶部banner --div classbanner-boximg srchttps://hongm-1312445828.cos.ap-nanjing.myqcloud.com/sg_top.png alt //div!-- 面包屑 --div classbreadcrumbspan/span/span购物车/span/div!-- 购物车主体 --div v-iffruitList.length 0 classmaindiv classtable!-- 头部 --div classtheaddiv classtrdiv classth选中/divdiv classth th-pic图片/divdiv classth单价/divdiv classth num-th个数/divdiv classth小计/divdiv classth操作/div/div/div!-- 身体 --div classtbodydivv-foritem in fruitList:keyitem.idclasstr:class{ active: item.isChecked }div classtdinput typecheckbox v-modelitem.isChecked //divdiv classtdimg :srcitem.icon alt //divdiv classtd{{ item.price }}/divdiv classtddiv classmy-input-numberbutton :disableditem.num 1 classdecrease clicksubGoods(item.id)-/buttonspan classmy-input__inner{{ item.num }}/spanbutton classincrease clickaddGoods(item.id)/button/div/divdiv classtd{{ item.price * item.num }}/divdiv classtd clickdelGoods(item.id)button删除/button/div/div/div/div!-- 底部 --div classbottom!-- 全选 --label classcheck-allinput typecheckbox /全选/labeldiv classright-box!-- 所有商品总价 --span classprice-box总价nbsp;nbsp;:nbsp;nbsp;¥nbsp;span classprice24/span/span!-- 结算按钮 --button classpay结算( 6 )/button/div/div/div!-- 空车 --div v-else classempty空空如也/div/div
/templatestyle scoped
import ./style/inputnumber.css;
import ./style/index.css;
/style
3. 购物车计算、全选
script setup langts
import { computed, ref } from vue// 定义水果对象的类型
interface Fruit {id: numbericon: stringisChecked: booleannum: numberprice: number
}// 水果列表
const fruitList refFruit[]([{id: 1,icon: https://hongm-1312445828.cos.ap-nanjing.myqcloud.com/ll.png,isChecked: true,num: 2,price: 6},{id: 2,icon: https://hongm-1312445828.cos.ap-nanjing.myqcloud.com/smt.png,isChecked: false,num: 7,price: 20},{id: 3,icon: https://hongm-1312445828.cos.ap-nanjing.myqcloud.com/tg.png,isChecked: false,num: 3,price: 40},{id: 4,icon: https://hongm-1312445828.cos.ap-nanjing.myqcloud.com/xg.png,isChecked: false,num: 10,price: 3},{id: 5,icon: https://hongm-1312445828.cos.ap-nanjing.myqcloud.com/yl.png,isChecked: false,num: 20,price: 34}
])// 删除商品
const delGoods (id: number) {fruitList.value fruitList.value.filter((item) item.id ! id)
}
// 添加
const addGoods (id: number) {const fruit fruitList.value.find((item) item.id id)fruit fruit.num
}
// 减少
const subGoods (id: number) {const fruit fruitList.value.find((item) item.id id)fruit fruit.num--
}// 全选
const checkAll computed({get() {return fruitList.value.every((item) item.isChecked)},set(value) {fruitList.value.forEach((item) (item.isChecked value))}
})// 统计选中的总数 reduce
const totalCount computed(() {return fruitList.value.reduce((sum, item) {if (item.isChecked) {// 选中 → 需要累加return sum item.num} else {// 没选中 → 不需要累加return sum}}, 0)
})// 总计选中的总价 num * price
const totalPrice computed(() {return fruitList.value.reduce((sum, item) {if (item.isChecked) {return sum item.num * item.price} else {return sum}}, 0)
})
/scripttemplatediv classapp-container idapp!-- 顶部banner --div classbanner-boximg srchttps://hongm-1312445828.cos.ap-nanjing.myqcloud.com/sg_top.png alt //div!-- 面包屑 --div classbreadcrumbspan/span/span购物车/span/div!-- 购物车主体 --div v-iffruitList.length 0 classmaindiv classtable!-- 头部 --div classtheaddiv classtrdiv classth选中/divdiv classth th-pic图片/divdiv classth单价/divdiv classth num-th个数/divdiv classth小计/divdiv classth操作/div/div/div!-- 身体 --div classtbodydivv-foritem in fruitList:keyitem.idclasstr:class{ active: item.isChecked }div classtdinput typecheckbox v-modelitem.isChecked //divdiv classtdimg :srcitem.icon alt //divdiv classtd{{ item.price }}/divdiv classtddiv classmy-input-numberbutton :disableditem.num 1 classdecrease clicksubGoods(item.id)-/buttonspan classmy-input__inner{{ item.num }}/spanbutton classincrease clickaddGoods(item.id)/button/div/divdiv classtd{{ item.price * item.num }}/divdiv classtd clickdelGoods(item.id)button删除/button/div/div/div/div!-- 底部 --div classbottom!-- 全选 --label classcheck-allinput typecheckbox v-modelcheckAll /全选/labeldiv classright-box!-- 所有商品总价 --span classprice-box总价nbsp;nbsp;:nbsp;nbsp;¥nbsp;span classprice{{ totalPrice }}/span/span!-- 结算按钮 --button classpay结算( {{ totalCount }} )/button/div/div/div!-- 空车 --div v-else classempty空空如也/div/div
/templatestyle scoped
import ./style/inputnumber.css;
import ./style/index.css;
/style
拓展知识
数据持久化localStorage
script setup langts
import { computed, ref, watch } from vue// 定义水果对象的类型
interface Fruit {id: numbericon: stringisChecked: booleannum: numberprice: number
}
const defaultData [{id: 1,icon: https://hongm-1312445828.cos.ap-nanjing.myqcloud.com/ll.png,isChecked: true,num: 2,price: 6},{id: 2,icon: https://hongm-1312445828.cos.ap-nanjing.myqcloud.com/smt.png,isChecked: false,num: 7,price: 20},{id: 3,icon: https://hongm-1312445828.cos.ap-nanjing.myqcloud.com/tg.png,isChecked: false,num: 3,price: 40},{id: 4,icon: https://hongm-1312445828.cos.ap-nanjing.myqcloud.com/xg.png,isChecked: false,num: 10,price: 3},{id: 5,icon: https://hongm-1312445828.cos.ap-nanjing.myqcloud.com/yl.png,isChecked: false,num: 20,price: 34}
]// 水果列表
let fruitList refFruit[](defaultData)
const localStorageFruitList localStorage.getItem(fruitList)
if (localStorageFruitList localStorageFruitList ! []) {fruitList.value JSON.parse(localStorageFruitList)
}// 删除商品
const delGoods (id: number) {fruitList.value fruitList.value.filter((item) item.id ! id)
}
// 添加
const addGoods (id: number) {const fruit fruitList.value.find((item) item.id id)fruit fruit.num
}
// 减少
const subGoods (id: number) {const fruit fruitList.value.find((item) item.id id)fruit fruit.num--
}// 全选
const checkAll computed({get() {return fruitList.value.every((item) item.isChecked)},set(value) {fruitList.value.forEach((item) (item.isChecked value))}
})// 统计选中的总数 reduce
const totalCount computed(() {return fruitList.value.reduce((sum, item) {if (item.isChecked) {// 选中 → 需要累加return sum item.num} else {// 没选中 → 不需要累加return sum}}, 0)
})// 总计选中的总价 num * price
const totalPrice computed(() {return fruitList.value.reduce((sum, item) {if (item.isChecked) {return sum item.num * item.price} else {return sum}}, 0)
})// 数据持久化方法
const saveData () {localStorage.setItem(fruitList, JSON.stringify(fruitList.value))
}
const getData () {const fruitListStr localStorage.getItem(fruitList)
}
// 删除持久化
const delData () {localStorage.removeItem(fruitList)
}
// 清空持久化数据
const clearData () {localStorage.clear()
}
// 监听
watch(() fruitList.value, saveData, { deep: true, immediate: true })
/scripttemplatediv classapp-container idapp!-- 顶部banner --div classbanner-boximg srchttps://hongm-1312445828.cos.ap-nanjing.myqcloud.com/sg_top.png alt //div!-- 面包屑 --div classbreadcrumbspan/span/span购物车/span/div!-- 购物车主体 --div v-iffruitList.length 0 classmaindiv classtable!-- 头部 --div classtheaddiv classtrdiv classth选中/divdiv classth th-pic图片/divdiv classth单价/divdiv classth num-th个数/divdiv classth小计/divdiv classth操作/div/div/div!-- 身体 --div classtbodydivv-foritem in fruitList:keyitem.idclasstr:class{ active: item.isChecked }div classtdinput typecheckbox v-modelitem.isChecked //divdiv classtdimg :srcitem.icon alt //divdiv classtd{{ item.price }}/divdiv classtddiv classmy-input-numberbutton :disableditem.num 1 classdecrease clicksubGoods(item.id)-/buttonspan classmy-input__inner{{ item.num }}/spanbutton classincrease clickaddGoods(item.id)/button/div/divdiv classtd{{ item.price * item.num }}/divdiv classtd clickdelGoods(item.id)button删除/button/div/div/div/div!-- 底部 --div classbottom!-- 全选 --label classcheck-allinput typecheckbox v-modelcheckAll /全选/labeldiv classright-box!-- 所有商品总价 --span classprice-box总价nbsp;nbsp;:nbsp;nbsp;¥nbsp;span classprice{{ totalPrice }}/span/span!-- 结算按钮 --button classpay结算( {{ totalCount }} )/button/div/div/div!-- 空车 --div v-else classempty空空如也/div/div
/templatestyle scoped
import ./style/inputnumber.css;
import ./style/index.css;
/style
总结
