自定义 v-model 指令

// two.js

export default {
    bind(el, binding, vnode){
        console.log(binding);
        el.value = binding.value
        if (/\.async/.test(binding.rawName)) {
            el.onchange = handleFn;
        } else {
            el.oninput = handleFn;
        }
        function handleFn(e){
            console.log(binding, e);
            vnode.context[binding.expression] = e.target.value;
        }
    },
    update(el,binding){
        console.log(binding);
        el.value = binding.value
        
    },
}

<template>
    <input v-two="msg">
</template>

<script>

import two from './two'

Vue.directive(‘two’, two);

export default {
    data(){
        return {msg: '1'}
    }
}

</script>