摘要：In my last article, i use a JSON tool to parse a JSON string, but there will be a JavaScript error:<div style="display: none;" class="initParameters">{ cred: "6B30E9A9E716C370E040E00A193871B8" }... 阅读全文

摘要：Today, Flyer notify me that the page is loading twice, very strange.And this is my step to solve the problem.1. Open firebugand discovertwo requests of home.do page (HTTP action - GET).2. Open HTTPWat... 阅读全文

摘要：The observer pattern (a subset of the asynchronous publish/subscribe pattern) is a software design pattern in which an object, called the subject, maintains a list of its dependents, called observers,... 阅读全文

摘要：Fast string concatenationWe always use + to concatenate small strings into a large one, which is considered to be a good practice.But there will be a major hit on performance if you do many string con... 阅读全文

摘要：JavaScript doesn’t have block scopeBlock doesn’t have scope in javascript, only function has scope.for(var i = 0; i < 2; i ++) { } i; // 2If you want to create scope, use anonymous fun... 阅读全文

摘要：Is undefined a reserved wordIt seems like so, but actually it doesn’t.var undefined = 'Hello'; undefined; // 'Hello'This may surprise you, but it does work well. undefined is just a pre-defined ... 阅读全文

摘要：Always specify the second argument - parseIntparseInt converts a string to an int number, the syntax is:parseInt(str, [radix])The second argument is optional, which specify the radix of the first argu... 阅读全文

摘要：Produce boolean value from other typesAll objects in JavaScript can be converted to boolean implicitly, look at these examples:0 == false; // true1 == true; // true'' == false // truenull == false // ... 阅读全文

摘要：I described how to use jStore as a client-side persistent storage in my last post. The jStore manage a number of different storage engines, such as gears and flash objects. But they all need additional downloads. The IE browser has provide a mechanism called userdata behavior to store max 128kb data a page, 1024kb a domain. This is a portion of DHTML that suppoted by IE5 or later. Refer to this article: userData Behavior. 阅读全文

摘要：In my opinion, there are two big things in Javascript's world - Closure and Prototype. Question 1. What does Prototype do in JavaScript? In a single word, it's a feature that aimed at reducing code duplication. We all know in computer world there is a famous philosophy - Don't Repeat Yourself. In classic object-oriented languages such as c++/c#/java, we have inheritance to encapsulate some common methods into a super class to reduce code lines. But in JavaScript, there is no concept o 阅读全文

摘要：AOP stands for Aspect-oriented programming. I think the main point of this technology is the ability to add code before or after a function execution. After some digging on the internet, i write my implement of AOP in JavaScript. 阅读全文

摘要：I used to write multiline strings in JavaScript like this:var str = 'This is ' +'a very long ' +'sentence.'Sometimes, i wrote it this way:var str = ['This is ','a very long ','sentence.'].join('');Usi... 阅读全文

摘要：They are two similar code below: 1.function User(name) {this.name = name;}User.prototype = { 'sex': 'man' };var user = new User('Zhang');alert(User.prototype['sex']); // manalert(user.constructor.pr... 阅读全文

摘要：类 C 语言一般都用于块级作用域，但是Javascript中的 while, if-else, for, switch-case 等控制结构不具有自己的作用域， 在Javascript中只有函数（function）具有自己的作用域，请比较如下的 C# 代码和 Javascript 代码 阅读全文

摘要：这是一个基础性的文章，使用Javascript观察DOM中的事件冒泡机制，并介绍如何阻止默认行为和如何组织事件冒泡的方法。分别在Firefox和IE下有对应的实现。 阅读全文

摘要：Currying好像是函数式语言都有的一个特性，比如Perl,Python,Javascript。 那么到底什么是Currying，我是在学习Closure时无意中接触到这个定义的，觉得很是有趣。 先看看 Wiki 中的定义： Currying is the technique of transforming a function that takes multiple arguments in such a way that it can be called as a chain of functions each with a single argument. 大概的意思就是说，将拥有多个参数的函数Currying化为拥有单一参数的函数形式。 阅读全文

摘要：这是一个老生常谈的问题了，不过还是拿我的解决办法来晒晒太阳。 最开始我是为Table中的每一项添加属性 class="item1" 的方式实现的，仔细分析，这里面使用的 getElementsByTagName 会把页面上所有的 input 标签都找到（包括单行文本输入框，按钮，所有的单选和多选框等），然后再执行过滤，这是一种效率不高的方法。 阅读全文

摘要：对于单行文本框，我们可以通过设置属性maxlength来限制可输入的最多字符数, 对于多行文本框，如果想限制最多可输入字符数，必须使用Javascript脚本来达到目的。 阅读全文

摘要：在Javascript中声明一个字符串，我们可以方便的使用literal（字面）语法： var str1 = 'Hello Javascript!'; var str2 = "Hello World!"; 由于在Javascript中，任何事物都是对象，所以我们也可以使用new语法创建： var str3 = new String("Hello Javascript!"); var str4 = new String("Hello World!"); 阅读全文