[1380] public path problem

I want to set the public path to be a relative path.

for example, i want this:

<script src="assets/manifest.ec59716a348942b2b17f.js"></script>
<script src="assets/1.nuxt.bundle.0cf0418edc2e2a30a9d7.js"></script>

But it always generates to this:

<script src="/assets/manifest.ec59716a348942b2b17f.js"></script>
<script src="/assets/1.nuxt.bundle.0cf0418edc2e2a30a9d7.js"></script>

This is my nuxt.config.js:

build: {
    publicPath: 'assets/'
}

I don't know why it always adds a "/" in the path.