Using a self executing anonymous function to solve the problem of a for loop using a closure _javascript tips

This code outputs 10 10 instead of the expected 0 to 9, because the closure is a reference to I, and then the function executes I has become 10

Function F1 () {
for (var i = 0; i < i++) {
settimeout (function () {
alert (i); 
}, 1000);
}
F1 ();

To solve the above problem, you can use the anonymous function of self execution

function F2 () {for
(var i = 0; i < i++) {
(function (e) {
settimeout (function () {
alert (e); 
}, 1000);
} (i);
}
F2 ();

The anonymous function here takes I as an argument, where E will have a copy of I, and the reference is a reference to E, which avoids the problem