js：table滚动到可视区域内时固定table头部在顶部

  1. index.html部分如下：
<!DOCTYPE html>
<html>

    <head>
        <meta charset="UTF-8">
        <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0, viewport-fit=cover">
        <title></title>
        <style>
            html,body {
                padding: 0;
                margin: 0;
            }
            
            .table-head-fixed {
                position: fixed;
                top: 0;
                left: 0;
                width: 100%;
            }
            
            table {
                width: 100%;
            }
            
            th {
                background-color: #ccc;
            }
            
            td,th {
                height: 2rem;
                width: 33.3%;
                padding: 0.5rem;
                box-sizing: border-box;
                border-bottom: 1px solid #ccc;
                border-right: 1px solid #ccc;
            }
            
            ul,li {
                margin: 0;
                padding: 0;
            }
            
            ul li {
                list-style: none;
                border-bottom: 1px solid #ccc;
                padding: 1rem;
            }
        </style>
        <script type="text/javascript" src="../echart-wx/js/vue.min.js"></script>
    </head>

    <body>
        <div id="app">
            <ul>
                <li v-for="(item,index) in ulData" :key="index">
                    {{item.name}}
                </li>
            </ul>
            <div class="table">
                <div class="table-head" ref="tableHead">
                    <table cellpadding="0" cellspacing="0">
                        <tr>
                            <th>age</th>
                            <th>name</th>
                            <th>sex</th>
                        </tr>
                    </table>
                </div>
                <div class="table-body" ref="tableBody">
                    <table cellpadding="0" cellspacing="0">
                        <tr v-for="(item,index) in tableData" :key="index">
                            <td>{{item.NAME}}</td>
                            <td>{{item.ACTIVE_TYPE}}</td>
                            <td>{{item.DATE}}</td>
                        </tr>
                    </table>
                </div>
            </div>
            <ul>
                <li v-for="(item,index) in ulData" :key="index">
                    {{item.name}}
                </li>
            </ul>
            <ul>
                <li v-for="(item,index) in ulData" :key="index">
                    {{item.name}}
                </li>
            </ul>
        </div>
    </body>
    <script type="text/javascript" src="js/table.js"></script>
    <script>
        var demo = new Vue({
            mixins: [table],
            el: "#app",
            data: function() {
                return {}
            },
            watch: {},
            mounted: function() {
                this.scroll()
            },
            created: function() {},
            methods: {
                scroll: function() {
                    var that = this
                    window.addEventListener('scroll', that.throttle(that, that.fixedTable, 200))

                },
                //函数节流,在规定时间内才执行一次图片加载函数，解决耗费性能，浏览器卡顿问题。
                throttle: function(that, fixedTable, wait) {
                    var lastTime = new Date().getTime()
                    return function() {
                        var curTime = new Date().getTime()
                        if(curTime - lastTime < wait) return
                        lastTime = curTime
                        fixedTable(that)
                    }
                },
                //固定table头部
                fixedTable: function(that) {
                    var eleOffsetTop = that.$refs.tableBody.offsetTop - that.$refs.tableHead.clientHeight
                    var scrollTop = document.body.scrollTop || document.documentElement.scrollTop;
                    var tableBodyH = that.$refs.tableBody.clientHeight
                    if(eleOffsetTop <= scrollTop && eleOffsetTop + tableBodyH > scrollTop) {
                        that.$refs.tableHead.className = "table-head table-head-fixed"
                    } else {
                        that.$refs.tableHead.className = "table-head"
                    }
                }
            }
        })
    </script>

</html>
  1. 混入js(table.js)部分如下：
var table = {
    data: function() {
        return {
            ulData: [{
                name: 1,
            }, {
                name: 2,
            }, {
                name: 3,
            }, {
                name: 4,
            }, {
                name: 5,
            }, {
                name: 6,
            }, {
                name: 4,
            }, {
                name: 5,
            }, {
                name: 6,
            }, {
                name: 4,
            }, {
                name: 5,
            }, {
                name: 6,
            }],
            tableData: [{
                    "NAME": "电影",
                    "TYPE": "兴趣",
                    "ACTIVE_TYPE": "社交",
                    "DATE": "2020-02-04",
                    "BEGIN_DATE": "09:30",
                    "END_DATE": "11:45",
                    "HOURS": "2小时15分钟",
                    "PERSON": 45,
                    "JOIN_PERSON": 30,
                    "SPONSOR": "独立区",
                    "LABEL": "",
                    "USE_PLACE": "2号楼多工能厅",
                    "SCOPE": "课程",
                    "SON_COURSE": "欣赏课",
                    "CLUB_NAME": "娱乐",
                    "TEACHER_NAME": "王xx",
                    "TEACHER_TYPE": "员工",
                    "DATA_UPDATE": "2020-02-04 13:50"
                },
                {
                    "NAME": "电影",
                    "TYPE": "兴趣",
                    "ACTIVE_TYPE": "社交",
                    "DATE": "2020-02-04",
                    "BEGIN_DATE": "09:30",
                    "END_DATE": "11:45",
                    "HOURS": "2小时15分钟",
                    "PERSON": 45,
                    "JOIN_PERSON": 30,
                    "SPONSOR": "独立区",
                    "LABEL": "",
                    "USE_PLACE": "2号楼多工能厅",
                    "SCOPE": "课程",
                    "SON_COURSE": "欣赏课",
                    "CLUB_NAME": "娱乐",
                    "TEACHER_NAME": "王xx",
                    "TEACHER_TYPE": "员工",
                    "DATA_UPDATE": "2020-02-04 13:50"
                }, {
                    "NAME": "电影",
                    "TYPE": "兴趣",
                    "ACTIVE_TYPE": "社交",
                    "DATE": "2020-02-04",
                    "BEGIN_DATE": "09:30",
                    "END_DATE": "11:45",
                    "HOURS": "2小时15分钟",
                    "PERSON": 45,
                    "JOIN_PERSON": 30,
                    "SPONSOR": "独立区",
                    "LABEL": "",
                    "USE_PLACE": "2号楼多工能厅",
                    "SCOPE": "课程",
                    "SON_COURSE": "欣赏课",
                    "CLUB_NAME": "娱乐",
                    "TEACHER_NAME": "王xx",
                    "TEACHER_TYPE": "员工",
                    "DATA_UPDATE": "2020-02-04 13:50"
                }, {
                    "NAME": "电影",
                    "TYPE": "兴趣",
                    "ACTIVE_TYPE": "社交",
                    "DATE": "2020-02-04",
                    "BEGIN_DATE": "09:30",
                    "END_DATE": "11:45",
                    "HOURS": "2小时15分钟",
                    "PERSON": 45,
                    "JOIN_PERSON": 30,
                    "SPONSOR": "独立区",
                    "LABEL": "",
                    "USE_PLACE": "2号楼多工能厅",
                    "SCOPE": "课程",
                    "SON_COURSE": "欣赏课",
                    "CLUB_NAME": "娱乐",
                    "TEACHER_NAME": "王xx",
                    "TEACHER_TYPE": "员工",
                    "DATA_UPDATE": "2020-02-04 13:50"
                },
                {
                    "NAME": "电影",
                    "TYPE": "兴趣",
                    "ACTIVE_TYPE": "社交",
                    "DATE": "2020-02-04",
                    "BEGIN_DATE": "09:30",
                    "END_DATE": "11:45",
                    "HOURS": "2小时15分钟",
                    "PERSON": 45,
                    "JOIN_PERSON": 30,
                    "SPONSOR": "独立区",
                    "LABEL": "",
                    "USE_PLACE": "2号楼多工能厅",
                    "SCOPE": "课程",
                    "SON_COURSE": "欣赏课",
                    "CLUB_NAME": "娱乐",
                    "TEACHER_NAME": "王xx",
                    "TEACHER_TYPE": "员工",
                    "DATA_UPDATE": "2020-02-04 13:50"
                }, {
                    "NAME": "电影",
                    "TYPE": "兴趣",
                    "ACTIVE_TYPE": "社交",
                    "DATE": "2020-02-04",
                    "BEGIN_DATE": "09:30",
                    "END_DATE": "11:45",
                    "HOURS": "2小时15分钟",
                    "PERSON": 45,
                    "JOIN_PERSON": 30,
                    "SPONSOR": "独立区",
                    "LABEL": "",
                    "USE_PLACE": "2号楼多工能厅",
                    "SCOPE": "课程",
                    "SON_COURSE": "欣赏课",
                    "CLUB_NAME": "娱乐",
                    "TEACHER_NAME": "王xx",
                    "TEACHER_TYPE": "员工",
                    "DATA_UPDATE": "2020-02-04 13:50"
                }, {
                    "NAME": "电影",
                    "TYPE": "兴趣",
                    "ACTIVE_TYPE": "社交",
                    "DATE": "2020-02-04",
                    "BEGIN_DATE": "09:30",
                    "END_DATE": "11:45",
                    "HOURS": "2小时15分钟",
                    "PERSON": 45,
                    "JOIN_PERSON": 30,
                    "SPONSOR": "独立区",
                    "LABEL": "",
                    "USE_PLACE": "2号楼多工能厅",
                    "SCOPE": "课程",
                    "SON_COURSE": "欣赏课",
                    "CLUB_NAME": "娱乐",
                    "TEACHER_NAME": "王xx",
                    "TEACHER_TYPE": "员工",
                    "DATA_UPDATE": "2020-02-04 13:50"
                }, {
                    "NAME": "电影",
                    "TYPE": "兴趣",
                    "ACTIVE_TYPE": "社交",
                    "DATE": "2020-02-04",
                    "BEGIN_DATE": "09:30",
                    "END_DATE": "11:45",
                    "HOURS": "2小时15分钟",
                    "PERSON": 45,
                    "JOIN_PERSON": 30,
                    "SPONSOR": "独立区",
                    "LABEL": "",
                    "USE_PLACE": "2号楼多工能厅",
                    "SCOPE": "课程",
                    "SON_COURSE": "欣赏课",
                    "CLUB_NAME": "娱乐",
                    "TEACHER_NAME": "王xx",
                    "TEACHER_TYPE": "员工",
                    "DATA_UPDATE": "2020-02-04 13:50"
                }, {
                    "NAME": "电影",
                    "TYPE": "兴趣",
                    "ACTIVE_TYPE": "社交",
                    "DATE": "2020-02-04",
                    "BEGIN_DATE": "09:30",
                    "END_DATE": "11:45",
                    "HOURS": "2小时15分钟",
                    "PERSON": 45,
                    "JOIN_PERSON": 30,
                    "SPONSOR": "独立区",
                    "LABEL": "",
                    "USE_PLACE": "2号楼多工能厅",
                    "SCOPE": "课程",
                    "SON_COURSE": "欣赏课",
                    "CLUB_NAME": "娱乐",
                    "TEACHER_NAME": "王xx",
                    "TEACHER_TYPE": "员工",
                    "DATA_UPDATE": "2020-02-04 13:50"
                },
                {
                    "NAME": "电影",
                    "TYPE": "兴趣",
                    "ACTIVE_TYPE": "社交",
                    "DATE": "2020-02-04",
                    "BEGIN_DATE": "09:30",
                    "END_DATE": "11:45",
                    "HOURS": "2小时15分钟",
                    "PERSON": 45,
                    "JOIN_PERSON": 30,
                    "SPONSOR": "独立区",
                    "LABEL": "",
                    "USE_PLACE": "2号楼多工能厅",
                    "SCOPE": "课程",
                    "SON_COURSE": "欣赏课",
                    "CLUB_NAME": "娱乐",
                    "TEACHER_NAME": "王xx",
                    "TEACHER_TYPE": "员工",
                    "DATA_UPDATE": "2020-02-04 13:50"
                }, {
                    "NAME": "电影",
                    "TYPE": "兴趣",
                    "ACTIVE_TYPE": "社交",
                    "DATE": "2020-02-04",
                    "BEGIN_DATE": "09:30",
                    "END_DATE": "11:45",
                    "HOURS": "2小时15分钟",
                    "PERSON": 45,
                    "JOIN_PERSON": 30,
                    "SPONSOR": "独立区",
                    "LABEL": "",
                    "USE_PLACE": "2号楼多工能厅",
                    "SCOPE": "课程",
                    "SON_COURSE": "欣赏课",
                    "CLUB_NAME": "娱乐",
                    "TEACHER_NAME": "王xx",
                    "TEACHER_TYPE": "员工",
                    "DATA_UPDATE": "2020-02-04 13:50"
                }, {
                    "NAME": "电影",
                    "TYPE": "兴趣",
                    "ACTIVE_TYPE": "社交",
                    "DATE": "2020-02-04",
                    "BEGIN_DATE": "09:30",
                    "END_DATE": "11:45",
                    "HOURS": "2小时15分钟",
                    "PERSON": 45,
                    "JOIN_PERSON": 30,
                    "SPONSOR": "独立区",
                    "LABEL": "",
                    "USE_PLACE": "2号楼多工能厅",
                    "SCOPE": "课程",
                    "SON_COURSE": "欣赏课",
                    "CLUB_NAME": "娱乐",
                    "TEACHER_NAME": "王xx",
                    "TEACHER_TYPE": "员工",
                    "DATA_UPDATE": "2020-02-04 13:50"
                }, {
                    "NAME": "电影",
                    "TYPE": "兴趣",
                    "ACTIVE_TYPE": "社交",
                    "DATE": "2020-02-04",
                    "BEGIN_DATE": "09:30",
                    "END_DATE": "11:45",
                    "HOURS": "2小时15分钟",
                    "PERSON": 45,
                    "JOIN_PERSON": 30,
                    "SPONSOR": "独立区",
                    "LABEL": "",
                    "USE_PLACE": "2号楼多工能厅",
                    "SCOPE": "课程",
                    "SON_COURSE": "欣赏课",
                    "CLUB_NAME": "娱乐",
                    "TEACHER_NAME": "王xx",
                    "TEACHER_TYPE": "员工",
                    "DATA_UPDATE": "2020-02-04 13:50"
                }, {
                    "NAME": "电影",
                    "TYPE": "兴趣",
                    "ACTIVE_TYPE": "社交",
                    "DATE": "2020-02-04",
                    "BEGIN_DATE": "09:30",
                    "END_DATE": "11:45",
                    "HOURS": "2小时15分钟",
                    "PERSON": 45,
                    "JOIN_PERSON": 30,
                    "SPONSOR": "独立区",
                    "LABEL": "",
                    "USE_PLACE": "2号楼多工能厅",
                    "SCOPE": "课程",
                    "SON_COURSE": "欣赏课",
                    "CLUB_NAME": "娱乐",
                    "TEACHER_NAME": "王xx",
                    "TEACHER_TYPE": "员工",
                    "DATA_UPDATE": "2020-02-04 13:50"
                },
                {
                    "NAME": "电影",
                    "TYPE": "兴趣",
                    "ACTIVE_TYPE": "社交",
                    "DATE": "2020-02-04",
                    "BEGIN_DATE": "09:30",
                    "END_DATE": "11:45",
                    "HOURS": "2小时15分钟",
                    "PERSON": 45,
                    "JOIN_PERSON": 30,
                    "SPONSOR": "独立区",
                    "LABEL": "",
                    "USE_PLACE": "2号楼多工能厅",
                    "SCOPE": "课程",
                    "SON_COURSE": "欣赏课",
                    "CLUB_NAME": "娱乐",
                    "TEACHER_NAME": "王xx",
                    "TEACHER_TYPE": "员工",
                    "DATA_UPDATE": "2020-02-04 13:50"
                }, {
                    "NAME": "电影",
                    "TYPE": "兴趣",
                    "ACTIVE_TYPE": "社交",
                    "DATE": "2020-02-04",
                    "BEGIN_DATE": "09:30",
                    "END_DATE": "11:45",
                    "HOURS": "2小时15分钟",
                    "PERSON": 45,
                    "JOIN_PERSON": 30,
                    "SPONSOR": "独立区",
                    "LABEL": "",
                    "USE_PLACE": "2号楼多工能厅",
                    "SCOPE": "课程",
                    "SON_COURSE": "欣赏课",
                    "CLUB_NAME": "娱乐",
                    "TEACHER_NAME": "王xx",
                    "TEACHER_TYPE": "员工",
                    "DATA_UPDATE": "2020-02-04 13:50"
                }, {
                    "NAME": "电影",
                    "TYPE": "兴趣",
                    "ACTIVE_TYPE": "社交",
                    "DATE": "2020-02-04",
                    "BEGIN_DATE": "09:30",
                    "END_DATE": "11:45",
                    "HOURS": "2小时15分钟",
                    "PERSON": 45,
                    "JOIN_PERSON": 30,
                    "SPONSOR": "独立区",
                    "LABEL": "",
                    "USE_PLACE": "2号楼多工能厅",
                    "SCOPE": "课程",
                    "SON_COURSE": "欣赏课",
                    "CLUB_NAME": "娱乐",
                    "TEACHER_NAME": "王xx",
                    "TEACHER_TYPE": "员工",
                    "DATA_UPDATE": "2020-02-04 13:50"
                }, {
                    "NAME": "电影",
                    "TYPE": "兴趣",
                    "ACTIVE_TYPE": "社交",
                    "DATE": "2020-02-04",
                    "BEGIN_DATE": "09:30",
                    "END_DATE": "11:45",
                    "HOURS": "2小时15分钟",
                    "PERSON": 45,
                    "JOIN_PERSON": 30,
                    "SPONSOR": "独立区",
                    "LABEL": "",
                    "USE_PLACE": "2号楼多工能厅",
                    "SCOPE": "课程",
                    "SON_COURSE": "欣赏课",
                    "CLUB_NAME": "娱乐",
                    "TEACHER_NAME": "王xx",
                    "TEACHER_TYPE": "员工",
                    "DATA_UPDATE": "2020-02-04 13:50"
                }
            ]
        }

    },
}
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