CODE EXAMPLE FOR JAVASCRIPT

check user login or not in Shopify

{% if shop.customer_accounts_enabled %}
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  	{% if customer %}
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    	<a href="{{ routes.account_url }}">Account</a>
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  	{% else %}
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    	<a href="{{ routes.account_login_url }}">Login</a>
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    	{% if shop.customer_accounts_optional %}
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      	<span>or</span>
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      	<a href="{{ routes.account_register_url }}">Create an account</a>
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    	{% endif %}
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  	{% endif %}
12	{% endif %}