9、JavaScript 单例模式与方法链技术详解

JavaScript 单例模式与方法链技术详解

1. 单例模式中的私有成员实现

在 JavaScript 里，使用闭包来实现单例模式中的真正私有成员是一种有效的方式。以 DataParser 为例，代码如下：

/* DataParser singleton, converts character delimited strings into arrays. */ 
/*   Now using true private methods. */
GiantCorp.DataParser = (function() {
    // Private attributes.
    var whitespaceRegex = /\s+/;
    // Private methods.
    function stripWhitespace(str) {
        return str.replace(whitespaceRegex, '');
    }
    function stringSplit(str, delimiter) {
        return str.split(delimiter);
    }
    // Everything returned in the object literal is public, but can access the
    // members in the closure created above.
    return { 
        // Public method.
        stringToArray: fun