Comments (1)
在 getSinge 函数中,实际上也提到了闭包和高阶函数的概念。单例模式是一种简单但非常实
用的模式,特别是惰性单例技术,在合适的时候才创建对象,并且只创建唯一的一个。更奇妙的
是,创建对象和管理单例的职责被分布在两个不同的方法中,这两个方法组合起来才具有单例模
式的威力。
// 单一原则 - 管理单例
var getSingle = function (fn) {
var result;
return function () {
return result || (result = fn.apply(this, arguments));
};
};
// 单一原则 - 创建对象
var createLoginLayer = function () {
var div = document.createElement("div");
div.innerHTML = "我是登录浮窗";
div.style.display = "none";
document.body.appendChild(div);
return div;
};
// 单一原则 - 创建对象
var createSingleIframe = getSingle( function(){
var iframe = document.createElement ( 'iframe' );
document.body.appendChild( iframe );
return iframe;
});
var createSingleLoginLayer = getSingle(createLoginLayer);
from js-design-mode.
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