Javascript循环未运行或未结束

Question

I want to start with a large number in a variable, and while it is larger than another number, subtract 100 from the variable. I then want the loop to put the variable in the "demo" paragraph, which should end up being 89. Any help is appreciated.

 var x = 789 while x > 100 { x = x-100 } document.getElementById("demo").innerHTML = x; 

 <p id="demo"></p> 

Answer 1

Your while condition must be wrapped in parentheses.

 var x = 789 while (x > 100) { x = x-100 } document.getElementById("demo").innerHTML = x; 

 <p id="demo"></p> 

Answer 2

Using parenthesis in the while will fix your problem, just a small syntactical error

var x = 789
while (x > 100) {
  x = x-100
}

Answer 3

try this,

function sub(x){
while(x > 100){
x = x-100
}
return x
}
document.getElementById("demo").innerHTML = sub(789);

Answer 4

Uhm - ok - I am really really really rusty at programming, but... you want to generate a predetermined static number and place that static number in a static html element programmatically? WTF man?

<p id="demo">89</p>

Is your solution.

No Javascript req'd. Unless you were hoping for a 'countdown' effect which: 1) Wont work with this code. 2) Wont work with corrected code. 3) Would work with a different methodology so fast you wont see it (you would have to introduce 'sleep' timers and so on).

It's been a bad day please don't take a picture.