how to pass csrf token in javascript code example

Example 1: how to get csrf token in javascript

<input type="hidden" name="csrftoken" value="hgdillksdbgjksdbkvbskb">

Example 2: how to get csrf token in javascript

csrftoken = document.mainform.csrftoken.value;
# Do something with the CSRF token, like add dynamic values, like sha256(csrftoken + "dynamicvalue");
document.mainform.csrftoken.value = csrftoken;