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    说明：前端单独做的表格分页—用于解决数据过多页面渲染压力，如果是服务器响应数据过慢，使用第二种分页方法–后端分页。以下为分页效果

    40、使用elementUI分别实现前端，后端表格分页插图

    一、前端分页

    1、创建表格
    <el-table
            :key="new Date().getTime()"
            :data="tableData.slice((currentPage-1)*pageSize,currentPage*pageSize)"
            row-key="id"
            ref="table"
            style="width: 100%"
        >

            <template v-for="(item, idx) in tableHead">
                <el-table-column
                    :key="item.key"
                    :prop="item.value"
                    :label="item.name"
                    align="center"
                >
                </el-table-column>
            </template>
        </el-table>

    说明：slice(a,b)的作用是从已有的数组中返回选定的元素”a”表示开始，”b”表示结束。 而currentPage和pageSize在此网页的作用会在接下来进行说明。

    2、创建分页
    <el-pagination align='center' 
   @size-change="handleSizeChange" 
   @current-change="handleCurrentChange"
   :current-page="currentPage" 
   :page-sizes="[1,5,10,20]" 
   :page-size="pageSize" 
   layout="total, sizes, prev, pager, next, jumper" 
   :total="tableData.length">
</el-pagination>

    40、使用elementUI分别实现前端，后端表格分页插图(1)

    说明分页器绑定变量说明：
    :current-page的值表示当前是第几页；
    :page-sizes的值表示可以选择一页多少条；
    :page-size的值表示当前一页显示几条；
    layout的值表示分页需要显示的内容，例如“total” 表示总数、“next” 表示下一页等；
    :total的值表示共多少条数据；
    根据变量pageSize值，以及当前页变量currentPage，在界面上会自动把分的页显示出来，如上图中的：1、2、3……6…。
    3、在data中定义变量
    data() {
            return {
                tableData: [],
                tableHead: [
                    {name: "母线名称", value: 'busName',  },
                    {name: "电压等级", value: 'voltageLevel',  },
                    {name: "开始时间", value: 'startDate', },
                    {name: "恢复时间", value: 'recoverDate',  },
                    {name: "持续时间(分钟)", value: 'continuedDate', },
                    {name: "越限类型", value: 'limitType',  },
                    {name: "越限极值", value: 'limitValue',  },
                ],
                currentPage: 1, // 当前页码
                total: 20, // 总条数
                pageSize: 2, // 每页的数据条数
            };
        },

    4、 添加事件

    methods: {
     //每页条数改变时触发 选择一页显示多少行
     handleSizeChange(val) {
         console.log(`每页 ${val} 条`);
         this.currentPage = 1;
         this.pageSize = val;
     },
     //当前页改变时触发 跳转其他页
     handleCurrentChange(val) {
         console.log(`当前页: ${val}`);
         this.currentPage = val;
     }
}

    5、完整前端分页代码展示

    <template>
<div class="v-table" ref="tableheight" style="width: 100%; height: 100%">
<el-table
:key="new Date().getTime()"
:data="tableData.slice((currentPage-1)*pageSize,currentPage*pageSize)"
row-key="id"
ref="table"
style="width: 100%;height: calc(100% - 60px)"
>
<template v-for="(item, idx) in tableHead">
<el-table-column
:key="item.key"
:prop="item.value"
:label="item.name"
align="center"
>
</el-table-column>
</template>
</el-table>
<!-- 分页器 -->
<div class="block-box">
<el-pagination align='center'
@size-change="handleSizeChange"
@current-change="handleCurrentChange"
:current-page="currentPage"
:page-sizes="[1,5,10,20]"
:page-size="pageSize"
layout="total, sizes, prev, pager, next, jumper"
:total="tableData.length">
</el-pagination>
</div>
</div>
</template>
<script>
export default {
data() {
return {
tableData: [
{
busName:"xxx",
voltageLevel:"",
startDate:"",
recoverDate:"",
continuedDate:"",
limitType:"",
limitValue:"",  
},{
busName:"xxx",
voltageLevel:"",
startDate:"",
recoverDate:"",
continuedDate:"",
limitType:"",
limitValue:"",  
},{
busName:"xxx",
voltageLevel:"",
startDate:"",
recoverDate:"",
continuedDate:"",
limitType:"",
limitValue:"",  
},{
busName:"xxx",
voltageLevel:"",
startDate:"",
recoverDate:"",
continuedDate:"",
limitType:"",
limitValue:"",  
},{
busName:"xxx",
voltageLevel:"",
startDate:"",
recoverDate:"",
continuedDate:"",
limitType:"",
limitValue:"",  
},{
busName:"xxx",
voltageLevel:"",
startDate:"",
recoverDate:"",
continuedDate:"",
limitType:"",
limitValue:"",  
},{
busName:"xxx",
voltageLevel:"",
startDate:"",
recoverDate:"",
continuedDate:"",
limitType:"",
limitValue:"",  
},
],
tableHead: [
{name: "母线名称", value: 'busName',  },
{name: "电压等级", value: 'voltageLevel',  },
{name: "开始时间", value: 'startDate', },
{name: "恢复时间", value: 'recoverDate',  },
{name: "持续时间(分钟)", value: 'continuedDate', },
{name: "越限类型", value: 'limitType',  },
{name: "越限极值", value: 'limitValue',  },
],
currentPage: 1, // 当前页码
total: 20, // 总条数
pageSize: 2, // 每页的数据条数
};
},
mounted() {
},
methods: {
// 表格分页---前端分页
//每页条数改变时触发 选择一页显示多少行
handleSizeChange(val) {
this.currentPage = 1;
this.pageSize = val;
},
//当前页改变时触发 跳转其他页
handleCurrentChange(val) {
this.currentPage = val;
},
}
};
</script>
<style lang="less">
.v-table {
//分页样式
.block-box{
width: 100%;
height: 50px;
margin-top: 10px;
display: flex;
justify-content: center;
align-items: center;
}
}
</style>

    二、后端分页

    后端分页就是，根据前端所给后端传的两个参数处理判断响应数据，第一参数：每一页多少条数据pageSize，第二个参数：当前所选中的页码currenPage，进行
    说明：表格模板代码以及分页器代码创建步骤同上，唯一不同就是总表格数据条数:total不就是后端响应的表格数据长度，需要后端另外返回表格数据总数;否则分页器只显示第1页。

    1、js代码

    methods: {
//表格分页操作
//每页条数改变时触发 选择一页显示多少行
handleSizeChange(val){
this.pageSize = val;
this.params = {
pageSize:this.pageSize,
currentPage:this.currentPage,
}
this.getDialogData(val,this.currentPage,this.dialogTableUrl, this.params);
},
//当前页改变时触发 跳转其他页
handleCurrentChange(val){
this.currentPage = val;
this.params = {
pageSize:this.pageSize,
currentPage:this.currentPage,
}
this.getDialogData(this.pageSize,val,this.dialogTableUrl, this.params);
},
getDialogData(pageSize,currentPage,url, params) {
getRequestData(url, 'get', params).then((res) => {
if (res.status == 200){
let data = res.data.data;
this.total = data.num;//总数据条数
this.tableData = data.list
}
})
},
}

    3.完整后端分页代码

    <template>
<div class="v-table" ref="tableheight" style="width: 100%; height: 100%">
<el-table
:key="new Date().getTime()"
:data="tableData"
row-key="id"
ref="table"
style="width: 100%;height: calc(100% - 60px)"
>
<template v-for="(item, idx) in tableHead">
<el-table-column
:key="item.key"
:prop="item.value"
:label="item.name"
align="center"
>
</el-table-column>
</template>
</el-table>
<!-- 分页器 -->
<div class="block-box">
<el-pagination align='center'
@size-change="handleSizeChange"
@current-change="handleCurrentChange"
:current-page="currentPage"
:page-sizes="[1,5,10,20]"
:page-size="pageSize"
layout="total, sizes, prev, pager, next, jumper"
:total="total">
</el-pagination>
</div>
</div>
</template>
<script>
export default {
data() {
return {
tableData: [
{
busName:"xxx",
voltageLevel:"",
startDate:"",
recoverDate:"",
continuedDate:"",
limitType:"",
limitValue:"",  
},{
busName:"xxx",
voltageLevel:"",
startDate:"",
recoverDate:"",
continuedDate:"",
limitType:"",
limitValue:"",  
},{
busName:"xxx",
voltageLevel:"",
startDate:"",
recoverDate:"",
continuedDate:"",
limitType:"",
limitValue:"",  
},{
busName:"xxx",
voltageLevel:"",
startDate:"",
recoverDate:"",
continuedDate:"",
limitType:"",
limitValue:"",  
},{
busName:"xxx",
voltageLevel:"",
startDate:"",
recoverDate:"",
continuedDate:"",
limitType:"",
limitValue:"",  
},{
busName:"xxx",
voltageLevel:"",
startDate:"",
recoverDate:"",
continuedDate:"",
limitType:"",
limitValue:"",  
},{
busName:"xxx",
voltageLevel:"",
startDate:"",
recoverDate:"",
continuedDate:"",
limitType:"",
limitValue:"",  
},
],
tableHead: [
{name: "母线名称", value: 'busName',  },
{name: "电压等级", value: 'voltageLevel',  },
{name: "开始时间", value: 'startDate', },
{name: "恢复时间", value: 'recoverDate',  },
{name: "持续时间(分钟)", value: 'continuedDate', },
{name: "越限类型", value: 'limitType',  },
{name: "越限极值", value: 'limitValue',  },
],
currentPage: 1, // 当前页码
total: 20, // 总条数
pageSize: 2, // 每页的数据条数
};
},
mounted() {
},
methods: {
// 表格分页---前端分页
//每页条数改变时触发 选择一页显示多少行
handleSizeChange(val) {
this.currentPage = 1;
this.pageSize = val;
},
//当前页改变时触发 跳转其他页
handleCurrentChange(val) {
this.currentPage = val;
},
}
};
</script>
<style lang="less">
.v-table {
//分页样式
.block-box{
width: 100%;
height: 50px;
margin-top: 10px;
display: flex;
justify-content: center;
align-items: center;
}
}
</style>
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