< td > < input type= "text" > < / td >
document.querySelectorAll ("td input [type = "text"]")
this sentence is to find input, what kind of input,
1. The parent node is td
2.type = "text"
now, I"m going to find out the td
1. Have child node input [type = "text"]
how to write this expression document.querySelectorAll
all input
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