After performing the onclick method, why labels will show undefined??-CodePudding

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After performing the onclick method, why labels will show undefined??

Time：09-23

Above:
When I perform the links [I] before onclick method, the output links [I] or normal a tag element
But
After when I perform the onclick method, I'll output the links after [I], output undefine undefined before! Why is this?????? consult

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