add html5 demo for online ws srv

zhaomingwork

2023-05-15 2ec6637c8d2e3c514008dc7609112420e32f6b5e

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beam_size: 10
penalty: 0.0
maxlenratio: 0.0
minlenratio: 0.0
ctc_weight: 0.5
lm_weight: 0.7