var questionNumberTime1='20220608';
方法一：
var
r=
questionNumberTime1
.replace(/^(\d{4})(\d{2})(\d{2})$/,
"$1/$2/$3"
)
方法二：
var
pattern = /(\d{4})(\d{2})(\d{2})/;
var
formatedDate = questionNumberTime1.replace(pattern,
'$1/$2/$3'
)
方法三：
var questionNumberTime='Q20220608';
var questionNumberTime1 = questionNumberTime.replace(/Q/g, "").split("")
questionNumberTime1.splice(4, 0, "/")
questionNumberTime1.splice(7, 0, "/")
var newquestionNumberTime = new Date(questionNumberTime1.join(""))
