this is a problem related to js closures
for (let i = 0; i < 5; iPP) {
setTimeout(function() {
console.log(i)
}, 1000 * i)
} 
for (let i = 0; i < 5; iPP) {
setTimeout(function() {
console.log(i)
}, 1000 * i)
}
setTimeout (fn, timer) is a timer, that is, register a function fn , timer (not necessarily exactly the same) and execute.
for this question, it is equivalent to registering five timers, which are 0s, 1s, 2s, 3s, and then execute the corresponding fn --> function () {console.log (i)} , so the effect is to print every other second.
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