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惰性单例简单应用
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| <!DOCTYPE html> | |
| <html lang="en"> | |
| <head> | |
| <meta charset="UTF-8"> | |
| <title>Title</title> | |
| </head> | |
| <body> | |
| <div id="hello"></div> | |
| <button onclick="open1()">open</button> | |
| <button onclick="close1()">close</button> | |
| <script> | |
| var getSingle = function(fn){ | |
| var result | |
| return function(){ | |
| return result || ( result = fn.apply(this, arguments) ) | |
| } | |
| } | |
| var createLoginLayer = function(){ | |
| var div = document.createElement( 'div' ) | |
| div.innerHTML = '我是登录浮窗' | |
| div.style.display = ' none ' | |
| hello.appendChild( div ) | |
| return div | |
| } | |
| //预渲染浮窗 | |
| var LoginLayer = getSingle( createLoginLayer ) | |
| //打开浮窗 | |
| function open1(){ | |
| LoginLayer().style.display = 'block' | |
| } | |
| //关闭浮窗 | |
| function close1(){ | |
| LoginLayer().style.display = 'none' | |
| } | |
| </script> | |
| </body> | |
| </html> |
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