[JavaScript知识库]jquery之锚点定位和jquery模拟锚点定位效果，页面滚动到相对应的位置时，所在的导航文字高亮显示

1.常见的锚点定位效果：

<a name="print"></a>
<div id="print">
<!-- HTTP请求没有 # -->

或

<a href="#print"></a>
<div id="print">
<!-- HTTP请求有 # -->

这种方法，如果网页中有顶部固定导航栏，那么常见的锚点定位就会被遮住了一部分，很难用样式弥补。于是可以考虑第二种方法 js模拟锚点跳转效果

2.js模拟锚点跳转效果 见上一篇详细介绍

这是锚点上一篇：jquery模拟锚点定位效果：锚点定位——如何设置锚点居页面顶部距离，锚点定位并距离顶部一定偏移

但是，这样模拟url是没有#（hash）值的 如果导航有其他分页，就不容易跳回了，比如：

当前页是楼盘信息详情页，如果我想点楼盘相册，想要的效果是跳转到首页，再锚点定位到楼盘相册的位置；
解决方案：
html:
给导航a标签 添加一个#锚点（与模拟锚点点击事件的class同名），后面再用js获取url的hash值，面加载后判断url 是否带有hash值，如有，侧js执行点击相应的hash 事件（附代码如下）

<div class="listnav cenbox">
    <div class="cenbox clearfix">
        <ul class="xiangqingul">
            <li class="on">
                <a href="#huxingmao" class="huxingmao">楼盘户型</a>
            </li>
            <li>
                <a href="#xiangcemao" class="xiangcemao">楼盘相册</a>
            </li>
            <li>
                <a href="#xinximao" class="xinximao">楼盘信息</a>
            </li>
            <li>
                <a href="#mapmao" class="mapmao">位置配套</a>
            </li>
            <li>
                <a href="#fangdaimao" class="fangdaimao">贷款计算</a>
            </li>
            <li>
                <a href="#zixunmao" class="zixunmao">楼盘资讯</a>
            </li>
            <li>
                <a href="#tuijianmao" class="tuijianmao">好房推荐</a>
            </li>
        </ul>
        <p class="tel">咨询电话: 400-815-8655</p>
    </div>
</div>

css:

/* listnav */

.listnav {
    position: relative;
    width:1200px;
    margin:0 auto;
    background: #f4e827;
}

.listnav ul {
    float: left;
    position: relative;
    width: 900px;
    display: flex;
    flex-direction: row;
}

.listnav ul.xiangqingul {
    width: 930px;
}

.listnav ul li {
    position: relative;
    padding: 0 25px;
    font-size: 20px;
    line-height: 50px;
    color: #000;
    font-weight: 500px;
}

.listnav ul li a {
    color: #000;
}

.listnav ul li.on {
    color: #3490d3
}

.listnav ul li.on a, .listnav ul li:hover a {
    color: #3490d3
}

.listnav .searchcon {
    float: right;
    position: relative;
    width: 285px;
    height: 30px;
    margin-top: 10px;
    background: #fff;
    display: flex;
    flex-direction: row;
    justify-content: space-between;
    border-radius: 2px;
}

.listnav .tel {
    float: right;
    margin-right: 20px;
    font-size: 20px;
    line-height: 50px;
    color: #000;
    font-weight: 500px;
}

.listnav .searchbox {
    position: relative;
    width: 240px;
    height: 30px;
    padding-left: 10px;
    font-size: 14px;
    line-height: 30px;
    color: #666;
}

.listnav .searchbox .searchinp {
    display: block;
    position: relative;
    width: 100%;
    height: 100%;
    background: none;
    border: 0;
    outline: none;
}

.listnav .searchcon .searchico {
    width: 15px;
    height: 15px;
    margin: 7px 10px 0 0;
}

.listnav .searchcon .searchicoinp {
    position: absolute;
    top: 0;
    right: 0;
    width: 30px;
    height: 30px;
    opacity: 0;
    z-index: 2;
    cursor: pointer;
}

js:

// 锚点定位
            function topMao(target) {
                $('html, body').animate({
                    scrollTop: $(target).offset().top - $('.topfubox').height()
                }, 500); //130为锚点到距顶部的距离，500为执行时间
                return false;
            }

            $('.huxingmao').click(function () {
                topMao('#huxing');
            })
            $('.xiangcemao').click(function () {
                topMao('#xiangce');
            })
            $('.xinximao').click(function () {
                topMao('#xinxi');
            })
            $('.mapmao').click(function () {
                topMao('#map');
            })
            $('.fangdaimao').click(function () {
                topMao('#fangdai');
            })
            $('.zixunmao').click(function () {
                topMao('#zixun');
            })
            $('.tuijianmao').click(function () {
                topMao('#tuijian');
            })

			//用js获取url的hash值，页面加载后判断url是否带有hash值，如有，侧js执行点击相应的hash事件
			var hash = window.location.hash;
            if (hash != '') {
                var hashinp = hash.substr(1, hash.length);
                console.log(hashinp);
                $('.' + hashinp).click();
            }

另：
页面滚动到相对应的位置时，所在的导航文字高亮显示；
html:

<div class="topfubox clearfix">
        <div class="topfucon cenbox clearfix">
            <div class="lefbox">
                <div class="ltop">
                    <p class="lptit">水岸花语(A栋)</p>
                    <p class="lptxt">3室2厅1卫</p>
                    <p class="lptxt">98.88㎡</p>
                    <p class="lptxt red">155万</p>
                </div>
                <div class="lbom bltan" type="6">
                    <p>发送楼盘最新资料和价格到手机 </p>
                    <span class="sendinfo">立即发送</span>
                </div>
            </div>
            <div class="rigbox">
                <div class="tximg">
                    <img src="img/guwenpic.jpg" alt="">
                </div>
                <div class="namebox">
                    <p class="name">刘朝</p>
                    <p class="yongjin">佣金≤2.0%
                        <span>|</span> 美堂房产
                    </p>
                </div>
                <div class="daikan">
                    <span>带看</span>
                    <!-- 带看 用线上咨询插件 -->
                    <span>电话咨询</span>
                    <!-- 以后做小程序 扫码拨号 -->
                    <a class="linkover" href="#" target="_blank"></a>
                </div>
            </div>
        </div>
        <div class="listnav cenbox">
            <div class="cenbox clearfix">
                <ul class="xiangqingul">
                    <li class="on">
                        <a href="#huxingmao" class="huxingmao">楼盘户型</a>
                    </li>
                    <li>
                        <a href="#xiangcemao" class="xiangcemao">楼盘相册</a>
                    </li>
                    <li>
                        <a href="#xinximao" class="xinximao">楼盘信息</a>
                    </li>
                    <li>
                        <a href="#mapmao" class="mapmao">位置配套</a>
                    </li>
                    <li>
                        <a href="#fangdaimao" class="fangdaimao">贷款计算</a>
                    </li>
                    <li>
                        <a href="#zixunmao" class="zixunmao">楼盘资讯</a>
                    </li>
                    <li>
                        <a href="#tuijianmao" class="tuijianmao">好房推荐</a>
                    </li>
                </ul>
                <p class="tel">咨询电话: 400-815-8655</p>
            </div>
            <!-- <div class="searchcon">        
                      <div class="searchbox">
                        <input type="text" placeholder="请试试输入楼盘名或小区" class="searchinp">
                      </div>
                      <img src="img/searchico.png" alt="" class="searchico">
                    </div> -->
        </div>
    </div>

css:

.topfucon {
    display: none;
    height: 100px;
}

.topfubox .lefbox {
    position: relative;
    float: left;
    width: 530px;
}

.topfubox .lefbox .ltop {
    position: relative;
    display: flex;
    flex-direction: row;
    justify-content: space-between;
    margin-top: 10px;
}

.topfubox .lefbox .ltop .lptit {
    position: relative;
    font-size: 24px;
    color: #000;
    line-height: 50px;
    margin-right: 20px;
    max-width: 220px;
    height: 50px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.topfubox .lefbox .ltop .lptxt {
    position: relative;
    font-size: 20px;
    color: #666;
    line-height: 50px;
}

.topfubox .lefbox .ltop .red {
    color: #ff3a3a;
}

.topfubox .lefbox .lbom {
    position: relative;
    display: flex;
    flex-direction: row;
    font-size: 16px;
    color: #333;
    line-height: 40px;
}

.topfubox .lefbox .lbom p {
    display: block;
    padding-left: 24px;
    background: url(../img/newhouseico.png) no-repeat 0 -198px;
}

.topfubox .lefbox .lbom span {
    color: #fff;
    padding: 0 15px;
    height: 26px;
    line-height: 26px;
    border-radius: 20px;
    background: #ff3a3a;
    margin-left: 10px;
    margin-top: 8px;
    cursor: pointer;
}

.topfubox .rigbox {
    float: right;
    position: relative;
    width: 450px;
    display: flex;
    flex-direction: row;
    justify-content: space-between;
    margin-top: 10px;
}

.topfubox .rigbox .tximg {
    position: relative;
    width: 80px;
    height: 80px;
    overflow: hidden;
    border-radius: 100%;
}

.topfubox .rigbox .tximg img {
    width: 100%;
    height: auto;
    min-height: 100%;
}

.topfubox .rigbox .namebox {
    position: relative;
    margin-left: 10px;
}

.topfubox .rigbox .namebox .name {
    font-size: 18px;
    color: #666;
    line-height: 40px;
}

.topfubox .rigbox .namebox .yongjin {
    font-size: 14px;
    color: #666;
    line-height: 30px;
}

.topfubox .rigbox .namebox .yongjin span {
    color: #999;
}

.topfubox .rigbox .daikan {
    display: flex;
    flex-direction: row;
    font-size: 16px;
    color: #fff;
    line-height: 34px;
    margin-left: 20px;
    margin-top: 28px;
}

.topfubox .rigbox .daikan span {
    display: block;
    height: 34px;
    margin-left: 10px;
    background: #ff3a3a;
    padding: 0 15px;
    border-radius: 20px;
    background: #ff3a3a;
    margin-left: 10px;
    cursor: pointer;
}

js:

var topBoxTop = $('.topfubox').offset().top + 50;
        var tab_l = $('.listnav li').length;
        var tabctnOffsetTopArr = [];
        var dingweiArr = ['huxing', 'xiangce', 'xinxi', 'map', 'fangdai', 'zixun', 'tuijian'];
        $(window).scroll(function () {
            setElPosition()
        })

        function setElPosition() {
            var top = $(document).scrollTop();
            if (top > topBoxTop) {
                console.log(1);
                $('.topfubox').addClass('fixed');
                $('.topfubox .listnav').removeClass('cenbox');
                $('.topfubox .topfucon,.zhanwei').show();
            } else {
                console.log(2);
                $('.topfubox').removeClass('fixed');
                $('.topfubox .listnav').addClass('cenbox');
                $('.topfubox .topfucon,.zhanwei').hide();
            }

            var setNavBarStyle = function (el, top, arr) {
                // if (clickSetStyle) {
                for (var i = 0; i < arr.length; i++) {
                    if (top >= arr[i]) {
                        el.eq(i).addClass('on').siblings('li').removeClass('on')
                    }
                }
                // }
            }
            setNavBarStyle($('.listnav .xiangqingul li'), top, tabctnOffsetTopArr)
        }


			$(document).ready(function () {
				setElPosition();
	            for (var i = 0; i < tab_l; i++) {
	                if (dingweiArr.length > 0) {
	                    var offsettop = $('#' + dingweiArr[i]).offset().top - 200;
	                    tabctnOffsetTopArr.push(offsettop)
	                }
	            }
	            console.log(tabctnOffsetTopArr);
	        })

思路：把页面锚点对应的板块id写入数组，页面加载 获取id距离页面顶部的高度，页面滚动事件执行，滚动到相应数组的高度值，则高亮显示相应的导航文字。

缺点：页面中导航板块不可缺少，如某页隐藏某一板块，则。。。问题待研究。。。

借鉴文章：https://blog.csdn.net/weixin_42839080/article/details/82825295

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