HTML page consuming lots of RAM
Multi tool use
HTML page consuming lots of RAM
Memory usage is high, but nothing is shown. The page keeps loading.
<html>
<title>Array</title>
<body onload="myFunction()">
<center>
<p id="demo">This is an array</p>
</center>
<script>
var globe;
var i = 0;
function myFunction() {
var sl = ["a", "b", "c", "d", "d", "e", "f"];
for (i = 0; i < 7; i) {
globe = sl[i];
setTimeout(pk, 50);
}
}
function pk() {
document.write(globe);
i++;
myFunction();
}
</script>
</body>
</html>
Can someone please explain to me, what's really happening in this script?
for (i = 0; i < 7; i)
add
++ to the for loop : for(var i = 0;i < 7;i++)– Taki
Jul 1 at 4:39
++
for loop
for(var i = 0;i < 7;i++)
I'm incrementing the value of "i" in function pk()
– Ritesh95
Jul 1 at 4:44
When you start to ask a question, you must finish it with marking one of them as a right answer, or up voting some of them that help you to understand the truth. I up vote your answer because it help me in some thing for example.
– AmerllicA
Jul 2 at 13:20
4 Answers
4
Informally, you can think of all your js code being executed on a single thread. What setTimeout(f,n) does is to execute function f when at least n milliseconds have passed, and that thread is idle. Since myFunction never returns, as it does not increment i internally, the thread never becomes idle, and pk is never called. The memory is being consumed by a huge amount of scheduled calls.
When you fix this, remember that you also have mutual recursion between pk and myFunction, which will also overload your browser with a huge number of calls.
Simple HTML never use lot of amount of RAM, if it's happen you must be sure there is a JavaScript code for implementing interaction that made this issue.
HTML
RAM
JavaScript
For your special code your problem is definitely your JavaScript code, your for loop is wrote badly. see:
JavaScript
for
for(i = 0;i < 7;i) // the last i must be i++
{
globe = sl[i];
setTimeout(pk,50);
}
With third i your loop act infinitely, so in third section you must declare step, the i++, change your code and you will see it works awesome.
i
i++
Good luck
Basically, to extrapolate a little bit on the answers above, the variable inside the loop never gets incremented, so therefore the loop will run indefinitely.
You are incrementing i in your pk() function, but that function never runs, as your app stalls on the infinite loop.
i
pk()
No, there is only the global i
– Jonas H
Jul 1 at 4:45
you are correct - i missed that there was no declaration in the loop. I'll edit my answer. thanks.
– perrysetgo
Jul 1 at 5:55
Adding i++ in loop solves the problem.
You can even use
for (items in sl){
//whatever code you want
}
This for ... in loop gives you benefit that you can transverse array of any size
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for (i = 0; i < 7; i)will run forever– CertainPerformance
Jul 1 at 4:39