there is an error defining the global directive v-color in Vue. The error content is: [Vue warn]: Failed to resolve directive: color 
 (found in < Anonymous >) 
 I don"t know what"s going on. 
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<script src="https://cdn.jsdelivr.net/npm/vue@2.6.6/dist/vue.js"></script>
<body>
<div id="app">
    <h2 v-color>{{msg}}</h2>
</div>
<script>
    var vm=new Vue({
        el:"-sharpapp",
        data:{
            msg:"3333ff"
        },
    })
    Vue.directive("color",{
        bind:function(el) {
            el.style.color="red"
        }
    })
</script>
</body>
</html>v-color made a mistake. Please take a look at it. Thank you ~
