Functions in setinterval cannot have parentheses

while The cycle will get stuck CPU, To use  setInterval Instead of .

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  Only once

<script>
var i=0;
function say() {
    i++;
    document.write(i+'<br>');
    if (i==10)
        clearInterval(id);
}
var id = setInterval(say(), 100);
</script>

Change to

<script>
var i=0;
function say() {
    i++;
    document.write(i+'<br>');
    if (i==10)
        clearInterval(id);
}
var id = setInterval(say, 100);
</script>

setInterval Method is executed only once after the parameter is extracted