Reading in the textbook wrote this is to remove the question mark in the beginning, but I didn't understand the logical meaning of the string of code, which master can help you explain it, thank you very much

CodePudding user response:

This is 3 the unary, equivalent to

 if (location. Search. Length & gt; 0 {
Qs=location. The search. The substring (1);//interception location. The search after the first position of the string is assigned to qs 
} else {
Qs=""; 
}