通过javascript事件构建css属性
我试图显示一个箭头,在单击时将用户引导到页面顶部: html代码通过javascript事件构建css属性,javascript,html,css,Javascript,Html,Css,我试图显示一个箭头,在单击时将用户引导到页面顶部: html代码 <a id="top" href="#"><img src="/img/arrow.png"></a> js代码 o = $; // misc junk o(function(){ var width = window.innerWidth; var height = window.innerHeight; var doc = o(document); // .onloa
<a id="top" href="#"><img src="/img/arrow.png"></a>
js代码
o = $;
// misc junk
o(function(){
var width = window.innerWidth;
var height = window.innerHeight;
var doc = o(document);
// .onload
o('html').addClass('onload');
// top link
o('#top').click(function(e){
o('body').animate({ scrollTop: 0 }, 'fast');
e.preventDefault();
});
// scrolling links
var added;
doc.scroll(function(e){
if (doc.scrollTop() > 5) {
if (added) return;
added = true;
o('body').addClass('scroll');
} else {
o('body').removeClass('scroll');
added = false;
}
})
// highlight code
o('pre.js code').each(function(){
o(this).html(highlight(o(this).text()));
})
})
// active menu junk
o(function(){
var prev;
var n = 0;
var headings = o('h3').map(function(i, el){
return {
top: o(el).offset().top,
id: el.id
}
});
function closest() {
var h;
var top = o(window).scrollTop();
var i = headings.length;
while (i--) {
h = headings[i];
if (top >= h.top - 1) return h;
}
}
o(document).scroll(function(){
var h = closest();
if (!h) return;
if (prev) {
prev.removeClass('active');
prev.parent().parent().removeClass('active');
}
var a = o('a[href="#' + h.id + '"]');
a.addClass('active');
a.parent().parent().addClass('active');
prev = a;
})
})
/**
* Highlight the given `js`.
*/
function highlight(js) {
return js
.replace(/</g, '<')
.replace(/>/g, '>')
.replace(/\/\/(.*)/gm, '<span class="comment">//$1</span>')
.replace(/('.*?')/gm, '<span class="string">$1</span>')
.replace(/(\d+\.\d+)/gm, '<span class="number">$1</span>')
.replace(/(\d+)/gm, '<span class="number">$1</span>')
.replace(/\bnew *(\w+)/gm, '<span class="keyword">new</span> <span class="init">$1</span>')
.replace(/\b(function|new|throw|return|var|if|else)\b/gm, '<span class="keyword">$1</span>')
}
将此设置到位,不会使箭头出现在页面的滚动条上。请问如何解决这个问题?半小时前你不是问过同样的问题吗?如果您放弃了这个问题,请删除它。请将CSS添加到代码示例中,或者更好地准备示例
o = $;
// misc junk
o(function(){
var width = window.innerWidth;
var height = window.innerHeight;
var doc = o(document);
// .onload
o('html').addClass('onload');
// top link
o('#top').click(function(e){
o('body').animate({ scrollTop: 0 }, 'fast');
e.preventDefault();
});
// scrolling links
var added;
doc.scroll(function(e){
if (doc.scrollTop() > 5) {
if (added) return;
added = true;
o('body').addClass('scroll');
} else {
o('body').removeClass('scroll');
added = false;
}
})
// highlight code
o('pre.js code').each(function(){
o(this).html(highlight(o(this).text()));
})
})
// active menu junk
o(function(){
var prev;
var n = 0;
var headings = o('h3').map(function(i, el){
return {
top: o(el).offset().top,
id: el.id
}
});
function closest() {
var h;
var top = o(window).scrollTop();
var i = headings.length;
while (i--) {
h = headings[i];
if (top >= h.top - 1) return h;
}
}
o(document).scroll(function(){
var h = closest();
if (!h) return;
if (prev) {
prev.removeClass('active');
prev.parent().parent().removeClass('active');
}
var a = o('a[href="#' + h.id + '"]');
a.addClass('active');
a.parent().parent().addClass('active');
prev = a;
})
})
/**
* Highlight the given `js`.
*/
function highlight(js) {
return js
.replace(/</g, '<')
.replace(/>/g, '>')
.replace(/\/\/(.*)/gm, '<span class="comment">//$1</span>')
.replace(/('.*?')/gm, '<span class="string">$1</span>')
.replace(/(\d+\.\d+)/gm, '<span class="number">$1</span>')
.replace(/(\d+)/gm, '<span class="number">$1</span>')
.replace(/\bnew *(\w+)/gm, '<span class="keyword">new</span> <span class="init">$1</span>')
.replace(/\b(function|new|throw|return|var|if|else)\b/gm, '<span class="keyword">$1</span>')
}