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参考这本书，有源代码。做一下注释
1️⃣ 单例模式
<html>
<body>
<button id="loginBtn">登录</button>
</body>
<script>
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;
};
document.getElementById( 'loginBtn' ).onclick = function(){
var loginLayer = createLoginLayer();
loginLayer.style.display = 'block';
};
</script>
</html>
<script type="text/javascript">
var createLoginLayer = (function(){
var div;
return function(){
if ( !div ){
div = document.createElement( 'div' );
div.innerHTML = '我是登录浮窗';
div.style.display = 'none';
document.body.appendChild( div );
}
return div;
}
})();
document.getElementById( 'loginBtn' ).onclick = function(){
var loginLayer = createLoginLayer();
loginLayer.style.display = 'block';
};
var createIframe= (function(){
var iframe;
return function(){
if ( !iframe){
iframe= document.createElement( 'iframe' );
iframe.style.display = 'none';
document.body.appendChild( iframe);
}
return iframe;
}
})();
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';
document.body.appendChild( div );
return div;
};
var createSingleLoginLayer = getSingle( createLoginLayer );
document.getElementById( 'loginBtn' ).onclick = function(){
var loginLayer = createSingleLoginLayer();
loginLayer.style.display = 'block';
};
//下面我们再试试创建唯一的iframe 用于动态加载第三方页面：
var createSingleIframe = getSingle( function(){
var iframe = document.createElement ( 'iframe' );
document.body.appendChild( iframe );
return iframe;
});
document.getElementById( 'loginBtn' ).onclick = function(){
var loginLayer = createSingleIframe();
loginLayer.src = 'http://baidu.com';
};
var bindEvent = function(){
$( 'div' ).one( 'click', function(){
alert ( 'click' );
});
};
var render = function(){
console.log( '开始渲染列表' );
bindEvent();
};
render();
render();
render();
var bindEvent = getSingle(function(){
document.getElementById( 'div1' ).onclick = function(){
alert ( 'click' );
}
return true;
});
var render = function(){
console.log( '开始渲染列表' );
bindEvent();
};
render();
render();
render();
</script>
