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In the background written in php, make an edit and use ajax. When initiating a request, the system prompts that json is not defined. What is wrong?

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In the background written in php, make an edit and use ajax. When initiating a request, the system prompts that json is not defined. What is wrong? In the background written in php, make an edit and use ajax. When initiating a request, the system prompts that json is not defined. What is wrong?

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In the background written in php, make an edit and use ajax. When initiating a request, the system prompts that json is not defined. What is wrong?

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