简单手写一个jqurey

/**
 * @description 手写jquery
 * @author ddxldxl
 */
class Jquery {
    constructor(selector) {
        //遍历dom树
        let res = document.querySelectorAll(selector)
        let length = res.length
        for( let i=0; i<length; i++) {
            this[i] = res[i]
        }
        this.length = length
        this.elements = res
    }

    get(index) {
        return this[index]
    }

    each(fn) {
        for( let i=0; i<this.length; i++ ) {
            let elment = this[i]
            fn(elment)
        }
    }

    on(type, fn) {
        return this.each(elem => {
            elem.addEventListener(type, fn, false)
        })
    }
}

//原型扩展
Jquery.prototype.dialog = function (){
    alert(123)
}

//继承扩展
class myJquery extends Jquery {
    constructor(selector) {
        super(selector)
    }

    addClass(){

    }

    style(){

    }
}