阿里巴巴笔试

请根据以下代码模板和测试用例，实现一个类 CSS 选择器的功能：
// 参考规则
const rules = {
‘a’: {
height: 0,
width: 10
},
‘#page .content a’: {
height: 5
},
‘#page a’: {
height: 10,
display: ‘block’
}
}

// 权重定义，#element(100) > .element(10) > element(1)
const WEIGHT = {
‘#’: 100,
‘.’: 10,
_default: 1,
}

const getRules = path => {
// your code here
}

console.log(getRules(‘a’));
//输出：{height: 0, width: 10}

console.log(getRules(‘#page a’));
//输出：{height: 10, width: 10, display: “block”}

console.log(getRules(‘#page .content a’));
//输出：{height: 5, width: 10, display: “block”}