I've finally inferred an answer from the following post: update Jenkins credentials by script
Thank you for "Thomasleveil".
The procedure is as followings:
1) Install Scriptler plugin and restart Jenkins server.
2) Click Scriptler in side menu.
3) Click Add a new Script.
4) Fill the form.

The script is from "https://wiki.jenkins-ci.org/display/JENKINS/Printing+a+list+of+credentials+and+their+IDs", but run itself straightly and you can see the error messages: "groovy.lang.MissingPropertyException: No such property: Jenkins for class: Script1 ... ".
This error has solved at "Running Groovy command from Jenkins using Groovy script plugin" post.
So your script is like:
import jenkins.model.Jenkins
def creds =
com.cloudbees.plugins.credentials.CredentialsProvider.lookupCredentials(
com.cloudbees.plugins.credentials.common.StandardUsernameCredentials.class,
Jenkins.instance,
null,
null
);
for (c in creds) {
println(c.id + ": " + c.description)
}
5) Type "http://your_jenkins/scriptler/run/getCredentialsIdList.groovy" in your browser url bar.
You can see the list of total credentialsIds from your jenkins server.
Enjoy that ~~~