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📜  javascript 检查变量是否存在 - Javascript 代码示例

📅  最后修改于: 2022-03-11 15:02:04.536000             🧑  作者: Mango

代码示例3
if 'myVar' in locals():
  # myVar exists.
if 'myVar' in globals():
  # myVar exists.