代码生成组件必须知道的代码，仅7行代码

	<div id="dialog"></div>
    <script>
    	// 生成css
        var css = document.createElement('style');
        css.textContent = `
        .aaa {
            height: 180px;
            width: 280px;
        }
    `;
        document.getElementsByTagName('head')[0].appendChild(css);
		// 生成dom
        var a = document.createElement('div')
        a.classList.add('aaa')
        a.innerHTML = 'xxx'
        document.getElementById('dialog').appendChild(a)
    </script>