非js软件工程师虚心求教一个事件绑定中的传递参数有关问题
非js程序员虚心求教一个事件绑定中的传递参数问题
--------------------
首先是popup.html
然后是popup.js
本帖最后由 J_Anthony 于 2014-03-13 17:41:44 编辑
先上问题，是我准备写一个chrome插件时看到的官方代码，主要就是一个json文件，一个html文件，一个js文件。json不管，问题在js文件中。先列出文件。--------------------
首先是popup.html
<!doctype html>
<html>
<head>
<title>Getting Started Extension's Popup</title>
<style>
body {
min-width: 357px;
overflow-x: hidden;
}
img {
margin: 5px;
border: 2px solid black;
vertical-align: middle;
width: 75px;
height: 75px;
}
</style>
<!--
- JavaScript and HTML must be in separate files: see our Content Security
- Policy documentation[1] for details and explanation.
-
- [1]: http://developer.chrome.com/extensions/contentSecurityPolicy.html
-->
<script src="popup.js"></script>
</head>
<body>
</body>
</html>
然后是popup.js
/**
* Global variable containing the query we'd like to pass to Flickr. In this
* case, kittens!
*
* @type {string}
*/
var QUERY = 'China';
var kittenGenerator = {
/**
* @type {string}
* @private
*/
searchOnFlickr_: 'https://secure.flickr.com/services/rest/?' +
'method=flickr.photos.search&' +
'api_key=90485e931f687a9b9c2a66bf58a3861a&' +
'text=' + encodeURIComponent(QUERY) + '&' +
'safe_search=1&' +
'content_type=1&' +
'sort=interestingness-desc&' +
'per_page=20',
/**
* Sends an XHR GET request to grab photos of lots and lots of kittens. The
* XHR's 'onload' event is hooks up to the 'showPhotos_' method.
*
* @public
*/
requestKittens: function() {
var req = new XMLHttpRequest();
req.open("GET", this.searchOnFlickr_, true);
req.onload = this.showPhotos_.bind(this);
req.send(null);
},
/**
* Handle the 'onload' event of our kitten XHR request, generated in
* 'requestKittens', by generating 'img' elements, and stuffing them into
* the document for display.
*
* @param {ProgressEvent} e The XHR ProgressEvent.
* @private
*/
showPhotos_: function (e) {
var kittens = e.target.responseXML.querySelectorAll('photo');
for (var i = 0; i < kittens.length; i++) {
var img = document.createElement('img');
img.src = this.constructKittenURL_(kittens[i]);
img.setAttribute('alt', kittens[i].getAttribute('title'));
document.body.appendChild(img);
}
},
/**
* Given a photo, construct a URL using the method outlined at
* http://www.flickr.com/services/api/misc.urlKittenl
*
* @param {DOMElement} A kitten.
* @return {string} The kitten's URL.
* @private
*/
constructKittenURL_: function (photo) {
return "http://farm" + photo.getAttribute("farm") +