In javascript dynamically add option. Selected: true, What reason is an error-CodePudding

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In javascript dynamically add option. Selected: true, What reason is an error

Time：10-01

See below

CodePudding user response:

Click the button after began to complain

CodePudding user response:

Math. Less behind the random ()

CodePudding user response:

refer to the second floor sky waves reply:

math.h less behind the random ()

Oh my god, look for half a day, thank you, the next note