add connect button for ws html5 (#621)

zhaomingwork

2023-06-12 d7e3ae17c3ac056752ecf5c41ff9a96645fcad49

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