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Copy path平滑锚点.html
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平滑锚点.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>伪锚点</title>
<style>
.anchor1, .anchor2{width:100px;height:100px;}
.anchor1{background:red;}
.anchor2{background:green;}
.spacing1, .spacing2{height:200px;}
.spacing1{background:yellow;}
.spacing2{background:gray;}
</style>
</head>
<body>
<p>
<a href="#w_anchor1">锚点1</a>
</p>
<p>
<a href="#w_anchor2">锚点2</a>
</p>
<p class="spacing1">间隔1</p>
<p class="spacing2">间隔2</p>
<p class="spacing1">间隔3</p>
<p class="spacing2">间隔4</p>
<p class="spacing1">间隔5</p>
<p class="spacing2">间隔6</p>
<p class="spacing1">间隔7</p>
<p class="spacing2">间隔8</p>
<div id="anchor1" class="anchor1">锚点1</div>
<p class="spacing1">间隔1</p>
<p class="spacing2">间隔2</p>
<p class="spacing1">间隔3</p>
<p class="spacing2">间隔4</p>
<p class="spacing1">间隔5</p>
<p class="spacing2">间隔6</p>
<p class="spacing1">间隔7</p>
<p class="spacing2">间隔8</p>
<div id="anchor2" class="anchor2">锚点2</div>
<p class="spacing1">间隔1</p>
<p class="spacing2">间隔2</p>
<p class="spacing1">间隔3</p>
<p class="spacing2">间隔4</p>
<p class="spacing1">间隔5</p>
<p class="spacing2">间隔6</p>
<p class="spacing1">间隔7</p>
<p class="spacing2">间隔8</p>
<script>
(function(window, undefined){
// 监听页面加载完成后，检查是否需要定位锚点
window.onload = function(){
scrollToAnchor();
};
// 监听地址栏url的hash值改变时，检查是否需要定位锚点
window.onhashchange = function(){
scrollToAnchor();
};
// 滚动到自定义的伪锚点
function scrollToAnchor(){
var hash = getHash(), // 获取url的hash值
anchor = getAnchor(hash), // 获取伪锚点的id
anchorDom, // 伪锚点dom对象
anchorScrollTop; // 伪锚点距离页面顶部的距离
// 如果不存在伪锚点,则直接结束
if(anchor.length < 1){
return;
}
anchorDom = getDom(anchor);
anchorScrollTop = anchorDom.offsetTop;
animationToAnchor(document.documentElement.scrollTop, anchorScrollTop);
}
/*
@function 滚动到指定位置方法
@param startNum {int} -- 开始位置
@param stopNum {int} -- 结束位置
*/
function animationToAnchor(startNum, stopNum){
var nowNum = startNum + 50; // 步进为10
if(nowNum > stopNum){
nowNum = stopNum;
}
// 缓动方法
window.requestAnimationFrame(function(){
document.documentElement.scrollTop = nowNum; // 当前示例页面，滚动条在body，所以滚动body
// 滚动到预定位置则结束
if(nowNum == stopNum){
return;
}
animationToAnchor(nowNum, stopNum); // 只要还符合缓动条件，则递归调用
});
}
// 获取锚点id
function getAnchor(str){
return checkAnchor(str) ? str.split("w_")[1] : "";
}
// 判断是否为特殊的hash值，也即是否为伪锚点
function checkAnchor(str){
return str.indexOf("w_") == 0 ? true : false;
}
// 获取hash值
function getHash(){
return window.location.hash.substring(1);
}
// 获取dom对象
function getDom(id){
return document.getElementById(id);
}
})(window);
</script>
</body>
</html>