我一直在试图找出 adb.json是什么以及为什么它会自动生成。hexo.io 中的所有文档都是：
$ hexo clean
Cleans the cache file (db.json) and generated files (public).
这到底是什么？由于这些都是静态页面，这是某种临时数据库吗？
I'm working on a react project to learn react.
In a component's render method, when I use .map to iterate over values and return an array of components, everything works as expected.
<ol className="books-grid">
{
books && books.map((book, index) => {
if (book.shelf === shelf) {
return (
<Book key={book && book.id ? book.id : index} changeShelf={this.props.changeShelf} book={book} />
);
}
})}
</ol>
But when I use filter:
<ol className="books-grid">
{
books && books.filter((book, index) => {
if (book.shelf …角度错误:错误:参数'StoreController as store'不是函数,未定义
index.html
<!DOCTYPE html>
<!-- runs the module when the document loads -->
<html ng-app='store'>
<head>
<link rel='stylesheet' type='text/css' href='http://netdna.bootstrapcdn.com/bootstrap/3.1.1/css/bootstrap.min.css'/>
</head>
<body>
<!-- expressions -->
<!-- directive controller name alias -->
<div ng-controller='StoreController as store'>
<h1> {{store.product.name}} </h1>
<h2>${{store.product.price}}</h2>
<p>{{store.product.description}}</p>
</div>
<script type = 'text/javascript' src='https://ajax.googleapis.com/ajax/libs/angularjs/1.0.1/angular.min.js'></script>
<script type ='text/javascript' src='app.js'></script>
</body>
</html>
app.js
// wrap the function inside a closure.
(function(){
var app = angular.module('store', []);
app.controller('StoreController', function(){
// will be executed when the store controller is called. …我试图确定为什么我得到以下行为.这是我想要更新的div:
<h3 id='guess-count'> 5 Guesses Remaining </h3>
工作守则:
$('#guess-count').html(startingCount = startingCount - 1 + " Guesses Remaining");
这将显示startingCount变量的更新值.
非工作
$('#guess-count').html(startingCount-- + " Guesses Remaining");
当我介入调试器时,我看到值确实发生了变化,但它没有在html视图中表达.但是,如果我再次运行它,它确实更新了html值,但是在它减去一个之前它的值是多少.这是一个例子:
// starting value and first pass
startingCount = 5
$('#guess-count').html(startingCount-- + " Guesses Remaining");
// startingCount html display value is 5 BUT startingCount holds the value of 4
startingCount = 4
//second pass
$('#guess-count').html(startingCount-- + " Guesses Remaining");
// startingCount html display value is 4 BUT startingCount holds the value of 3
它似乎显示了startingCount的当前值,然后从其值中减去一个值.
有谁知道为什么这样做？它似乎在更新html后评估'startingCount--'.
阅读这两篇文章后：
我仍然对以下代码感到困惑：
var num = 0;
num++ // returns 0
++num // returns 1
为什么剂量num++返回0？
我知道它先分配，然后再添加一个，但是我仍然不明白为什么它不显示1。
var num = 0;
num++ // returns 0
num // returns 1
我对以下示例感到非常困惑：
例：
var num = 0;
num++
// assigns then increments
// So if it assigns the num = 0, then increments to 1, Where is one being
//stored? Is it assigned anywhere?
还是分配表达式。
（我想表达是这样的：num = num + 1;）
这可能是我的最佳猜测，但对我来说还不是100％清楚，我仍然不明白为什么num ++显示/返回0而不是对表达式求值并返回1。