export function renderMixin(Vue) {
    Vue.prototype._c = function () {
        //创建标签
        return createElement(...arguments)
    }
    Vue.prototype._v = function (text) { //文本
        return createText(text)
    }
    Vue.prototype._s = function (val) {
        return val == null?"":(typeof val ==='object')?JSON.stringify(val):val
    }
    Vue.prototype._render = function () { //render函数变成 vnode
        let vm = this
        let render = vm.$options.render
        console.log(render,'||this is render')
        let vnode = render.call(this)
        // console.log(vnode)
        return vnode
    }
}
//vnode只可以描述节点

//创建元素
function createElement(tag,data={},...children){
    return vnode(tag,data,data.key,children)
}
//创建文本
function createText(text){
    return vnode(undefined,undefined,undefined,undefined,text)
}
//创建vnode
function vnode(tag,data,key,children,text){
    return {
        tag,
        data,
        key,
        children,
        text
    }
}

_c = function () {
    //创建标签
    return createElement(...arguments)
}
_v = function (text) { //文本
    return createText(text)
}
_s = function (val) {
    return val == null ? "" : (typeof val === 'object') ? JSON.stringify(val) : val
}

function createElement(tag, data = {}, ...children) {
    return vnode(tag, data, data.key, children)
}
//创建文本
function createText(text) {
    return vnode(undefined, undefined, undefined, undefined, text)
}
//创建vnode
function vnode(tag, data, key, children, text) {
    return {
        tag,
        data,
        key,
        children,
        text
    }
}

function test() {
    return _c('div', _v("张三"))
}

test()

console.log(this,"||this is this")
let vnode = render.call(this)