Vim completion method:
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Full line completionCTRL-X CTRL-L
Based on the keyword in the current fileCTRL-X CTRL-N
Dictionary-based completionCTRL-X CTRL-K
Supplemented by Dictionary of synonymsCTRL-X CTRL-T
Based on the keyword in the header fileCTRL-X CTRL-I
Complete by tagCTRL-X Ctrl-]
Complete file nameCTRL-X CTRL-F
Complement macro definitionCTRL-X CTRL-D
Complete Vim commandsCTRL-X CTRL-V
Custom completion ModeCTRL-X CTRL-U
Spelling suggestionsCTRL-X CTRL-S
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DefaultIs based on the keyword in the current file to complete, CTRL + N or Ctrl + P can be, do not press Ctrl + X,
Unless you switch to another completion method, you need Ctrl + x plus Ctrl + n to switch back to completion Based on the keyword in the file..