以弹窗为例
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>单例模式</title>
</head>
<body>
<button type="button" id="btnpop">弹出</button>
<button type="button" id="btnframe">iframe</button>
<script>
//把变 的部分封装，不变的隔离 ，开发-封闭原则
function createEl(fn) {
var result;
return function () {
if (!result) {
result = fn.apply(this, arguments);
}
return result;
}
}
function createWindow() {
var div = document.createElement("div");
div.innerHTML = '我是弹窗内容';
div.style.display = 'none';
document.body.appendChild(div);
return div;
}
function createIframe() {
var iframe = document.createElement("iframe");
iframe.style.display = 'none';
document.body.appendChild(iframe);
return iframe;
}
var fun01 = createEl(createWindow);
var fun02 = createEl(createIframe);
document.getElementById("btnpop").onclick = function () {
var el = fun01();
el.style.display = 'block';
};
document.getElementById("btnframe").onclick = function () {
var el = fun02();
el.style.display = 'block';
};
</script>
</body>
</html>
原创文章 207
获赞 173
访问量 3万+