贪心

把所有贪心策略都想出来，然后运算，选一个最好的，而不需要证明

function element(name,prop,children){
    let dom=document.createElement(name)
    for(let i in prop){
        dom.i=prop[i]
    }
    for(let i=0;i<children.length;i++){
        if(typeof children[i]=='string'){
            dom.innerHtml=children[i]
        }else dom.appendChild(element(children[i]))
    }
    return dom
}

element(‘ul’, {id: ‘list’}, [
element(‘li’, {class: ‘item’}, [‘Item 1’]),
element(‘li’, {class: ‘item’}, [‘Item 2’]),
element(‘li’, {class: ‘item’}, [‘Item 3’])
])