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Thanks very much for your reply.
I still have problem on this point.

You said, " The luaK_patchtohere function patches all jump
instructions in the given list to jump to the current instruction
("here"). "
But the implementation of luaK_patchtohere confused me.
I need more help on this problem.
By the way, Is there more information or comments on lua source code?
Especially, lcode.c

void luaK_patchtohere (FuncState *fs, int list) {
 luaK_concat(fs, &fs->jpc, list);

int luaK_jump (FuncState *fs) {
 int jpc = fs->jpc;  /* save list of jumps to here */
 int j;
 fs->jpc = NO_JUMP;
 j = luaK_codeAsBx(fs, OP_JMP, 0, NO_JUMP);
 luaK_concat(fs, &j, jpc);  /* keep them on hold */
 return j;