code 代码高亮功能测试(请看我在代码注释中描述的内容)
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一般的引用部分
一般的引用部分一般的引用部分一般的引用部分一般的引用部分一般的引用部分一般的引用部分一般的引用部分一般的引用部分一般的引用部分一般的引用部分一般的引用部分一般的引用部分一般的引用部分一般的引用部分一般的引用部分一般的引用部分一般的引用部分一般的引用部分一般的引用部分一般的引用部分一般的引用部分一般的引用部分一般的引用部分一般的引用部分一般的引用部分一般的引用部分一般的引用部分一般的引用部分一般的引用部分一般的引用部分一般的引用部分
<!--一般的html代码未能正常高亮,这里在 markdown 中是用四空格缩进写的代码块,由 markdown 转换为 html 之后, 由标签 pre code 包裹,审查元素可见>
<html>
<head>
<title>Script Defer Example</title>
</head>
<body>
<script type="text/javascript" defer>
alert("defer");
</script>
<script type="text/javascript">
alert("script");
</script>
<script type="text/javascript">
window.onload = function(){
alert("load");
};
</script>
</body>
</html>
一些要点
- 一个没有被赋值的变量会有个默认值 undefined
- null 与 undefined 的不同点：
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7//这里使用 三个`包含缩写的代码块,会显示行号,以 hexo-theme-huxblog 为基础,
//修改了背景和滚动条部分样式,为了高亮更加明显.但是遗憾没能正常高亮,这部分在开启 auto_detect: true 之后,
//能高亮,但是你看到的状态是未开启.在 markdown 转换为 html 之后,此部分代码由标签 figure 包裹
typeof null // object (bug in ECMAScript, should be null)
typeof undefined // undefined
null === undefined // false
null == undefined // true
//代码能正常高亮,这里在 markdown 三个`包含缩写的代码块,并指定了语言为javascript,不指定则不高亮
for(var i=0; i<10; i++) {
console.log(i);
}
/*
* jQuery One Page Nav Plugin
* http://github.com/davist11/jQuery-One-Page-Nav
*
* Copyright (c) 2010 Trevor Davis (http://trevordavis.net)
* Dual licensed under the MIT and GPL licenses.
* Uses the same license as jQuery, see:
* http://jquery.org/license
*
* @version 3.0.0
*
* Example usage:
* $('#nav').onePageNav({
* currentClass: 'current',
* changeHash: false,
* scrollSpeed: 750
* });
*/
;(function($, window, document, undefined){
// our plugin constructor
var OnePageNav = function(elem, options){
this.elem = elem;
this.$elem = $(elem);
this.options = options;
this.metadata = this.$elem.data('plugin-options');
this.$win = $(window);
this.sections = {};
this.didScroll = false;
this.$doc = $(document);
this.docHeight = this.$doc.height();
};
// the plugin prototype
OnePageNav.prototype = {
defaults: {
navItems: 'a',
currentClass: 'current',
changeHash: false,
easing: 'swing',
filter: '',
scrollSpeed: 750,
scrollThreshold: 0.5,
begin: false,
end: false,
scrollChange: false,
padding: 0
},
init: function() {
// Introduce defaults that can be extended either
// globally or using an object literal.
this.config = $.extend({}, this.defaults, this.options, this.metadata);
this.$nav = this.$elem.find(this.config.navItems);
//Filter any links out of the nav
if(this.config.filter !== '') {
this.$nav = this.$nav.filter(this.config.filter);
}
//Handle clicks on the nav
this.$nav.on('click.onePageNav', $.proxy(this.handleClick, this));
//Get the section positions
this.getPositions();
//Handle scroll changes
this.bindInterval();
//Update the positions on resize too
this.$win.on('resize.onePageNav', $.proxy(this.getPositions, this));
return this;
},
adjustNav: function(self, $parent) {
self.$elem.find('.' + self.config.currentClass).removeClass(self.config.currentClass);
$parent.addClass(self.config.currentClass);
},
bindInterval: function() {
var self = this;
var docHeight;
self.$win.on('scroll.onePageNav', function() {
self.didScroll = true;
});
self.t = setInterval(function() {
docHeight = self.$doc.height();
//If it was scrolled
if(self.didScroll) {
self.didScroll = false;
self.scrollChange();
}
//If the document height changes
if(docHeight !== self.docHeight) {
self.docHeight = docHeight;
self.getPositions();
}
}, 250);
},
getHash: function($link) {
return $link.attr('href').split('#')[1];
},
getPositions: function() {
var self = this;
var linkHref;
var topPos;
var $target;
self.$nav.each(function() {
linkHref = self.getHash($(this));
$target = $('#' + linkHref);
if($target.length) {
topPos = $target.offset().top;
self.sections[linkHref] = Math.round(topPos);
}
});
},
getSection: function(windowPos) {
var returnValue = null;
var windowHeight = Math.round(this.$win.height() * this.config.scrollThreshold);
for(var section in this.sections) {
if((this.sections[section] - windowHeight) < windowPos) {
returnValue = section;
}
}
return returnValue;
},
handleClick: function(e) {
var self = this;
var $link = $(e.currentTarget);
var $parent = $link.parent();
var newLoc = '#' + self.getHash($link);
if(!$parent.hasClass(self.config.currentClass)) {
//Start callback
if(self.config.begin) {
self.config.begin();
}
//Change the highlighted nav item
self.adjustNav(self, $parent);
//Removing the auto-adjust on scroll
self.unbindInterval();
//Scroll to the correct position
self.scrollTo(newLoc, function() {
//Do we need to change the hash?
if(self.config.changeHash) {
window.location.hash = newLoc;
}
//Add the auto-adjust on scroll back in
self.bindInterval();
//End callback
if(self.config.end) {
self.config.end();
}
});
}
e.preventDefault();
},
scrollChange: function() {
var windowTop = this.$win.scrollTop();
var position = this.getSection(windowTop);
var $parent;
//If the position is set
if(position !== null) {
$parent = this.$elem.find('a[href$="#' + position + '"]').parent();
//If it's not already the current section
if(!$parent.hasClass(this.config.currentClass)) {
//Change the highlighted nav item
this.adjustNav(this, $parent);
//If there is a scrollChange callback
if(this.config.scrollChange) {
this.config.scrollChange($parent);
}
}
}
},
scrollTo: function(target, callback) {
var offset = $(target).offset().top - this.config.padding;
$('html, body').animate({
scrollTop: offset
}, this.config.scrollSpeed, this.config.easing, callback);
},
unbindInterval: function() {
clearInterval(this.t);
this.$win.unbind('scroll.onePageNav');
}
};
OnePageNav.defaults = OnePageNav.prototype.defaults;
$.fn.onePageNav = function(options) {
return this.each(function() {
new OnePageNav(this, options).init();
});
};
})( jQuery, window , document );
- Number 数字类型，它并没有为整数给出一种特定的类型。除了能够表示浮点数外，还有一些带符号的值：+Infinity，
