Data function is called twice not once.

[audinue]

Vue.js version

1.0.21

Reproduction Link

http://jsbin.com/doxonuviwe/edit?html

Steps to reproduce

• Register a Vue component with data function.

Vue.component('my-hello', {
    data: function() {
        console.log('hello')
        return {};
    }
});

new Vue({
    el: 'body'
});

• Instantiate the component.

<my-hello></my-hello>
<my-hello></my-hello>

• You will see in the console (DevTool):

hello
hello
hello
hello

What is Expected?

Data function should be called twice since there is only two instances of Vue component.

What is actually happening?

Data function called four times.

Quick Fix

Set the data in the created hook.

Vue.component('my-component', {
    created: function() {
        this.$data  = {}; // Set your data here.
    },
});

Hope this helpful.

[blake-newman]

--- edited ---

Sorry re-read your issue and indeed this seems logical for only to be called per instance.

It however does not seem to be related to the amount of instances in the DOM. Each used component has the data initialisation called twice.