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all know that if you set a timer in a loop, use var and do not change the internal function to execute the function immediately, it will print out 5
in the loop.
all know that if you set a timer in a loop, use var and do not change the internal function to execute the function immediately, it will print out 5
in the loop.
the third is because the first argument you pass into setInterval is actually the result of the execution of a function, not a function
because there is no callback
let a = function(i){
console.log(i,"i")
}(i)
a;//undefinedPrevious: Vue v-for double nesting, delete the Div, of the child loop and retain the Div? of the parent loop
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