window.jquery = function(nodeOrSelector){
    let nodes = {};
    if(typeof nodeOrSelector === 'string'){
        //nodes = document.querySelectorAll(nodeOrSelector);//包含node的原型链
        let temp = document.querySelectorAll(nodeOrSelector);
        for(let i=0;i<temp.length;i++){
            nodes[i] = temp[i];
        }
        nodes.length = temp.length;
    }
    else if(nodeOrSelector instanceof Node){
        nodes = {0:nodeOrSelector,length: 1}
    }


    nodes.addClass = function(classes){
        for(let key in classes){
            var value = classes[key];
            var methodName = value ? 'add' : 'remove';
            for(let i=0;i<nodes.length;i++){
                nodes[i].classList[methodName](key);
            }
        }
    }
    /*nodes.getText = function(){
        var texts = [];
        for(let i=0;i<nodes.length;i++){
            texts.push(nodes[i].textContent)
        }
        return texts;
    }
    nodes.setText = function(text){
        for (var i = nodes.length - 1; i >= 0; i--) {
            nodes[i].textContent = text;
        }
    }*/
    nodes.text = function(text){
        if(text === undefined){
            var texts = [];
            for (let i = nodes.length - 1; i >= 0; i--) {
                texts.push(nodes[i].textContent);
            }
            return texts;
        }else{
            for (let i = nodes.length - 1; i >= 0; i--) {
                nodes[i].textContent = text;
            }
        }
    }
    return nodes;
}

var node2 = jquery('ul > li');
node2.addClass({a:true,b:false,c:true});
node2.text('hi');