When I try to understand plugin codes, I often find these kind of declarations but I don't know exactly what it means.
var a = b,c,d;
This is a syntactic shorthand, and identical to:
var a = b;
var c;
var d;
The first one (a) gets initialized with the value of b, but c and d are uninitialized.
它将定义var a = b
,然后定义var c和d
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