window.addEventListener(“hashchange”, function () { window.scrollTo(window.scrollX, window.scrollY - 100); });
这将允许浏览器为我们完成跳转到锚点的工作，然后我们将使用该位置进行偏移。
正如@erb指出的那样，仅当您在页面上更改哈希值时，此方法才有效。输入#something网址中已经存在的页面不适用于上述代码。这是处理该问题的另一个版本：
// The function actually applying the offset
function offsetAnchor() {
if(location.hash.length !== 0) {
window.scrollTo(window.scrollX, window.scrollY - 100);
}
}
// This will capture hash changes while on the page
window.addEventListener("hashchange", offsetAnchor);
// This is here so that when you enter the page with a hash,
// it can provide the offset in that case too. Having a timeout
// seems necessary to allow the browser to jump to the anchor first.
window.setTimeout(offsetAnchor, 1); // The delay of 1 is arbitrary and may not always work right (although it did in my testing).
注意：要使用jQuery，您只需 在示例中将替换window.addEventListener为$(window).on。谢谢@Neon。
如少数人所指出的，如果您连续两次单击同一锚点链接，则以上操作将失败，因为没有hashchange事件会强制偏移。
此解决方案是@Mave的建议的非常轻微的修改版本，并使用jQuery选择器进行简化
// The function actually applying the offset
function offsetAnchor() {
if (location.hash.length !== 0) {
window.scrollTo(window.scrollX, window.scrollY - 100);
}
}
// Captures click events of all <a> elements with href starting with #
$(document).on('click', 'a[href^="#"]', function(event) {
// Click events are captured before hashchanges. Timeout
// causes offsetAnchor to be called after the page jump.
window.setTimeout(function() {
offsetAnchor();
}, 0);
});
// Set the offset when entering page with hash present in the url
window.setTimeout(offsetAnchor, 0);
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