That is because you are only writing to the document once.

For this, you should probably use a for loop.

for (let x = 0+1; x < 5+1; x++) {
  document.write(x);
}

This says x = 0 + 1 = 1 (so it starts at 0), then for every x > 5 + 1 (the +1 is so it ends at 5) do this, then add 1 to x.

Simply: x = 1, then when x is over 5, it will write to the document, then it will add 1 to x to continue the loop.

Each time the loop is repeated, the value in the x variable is updated. x++ increases the value of x by one unit And you write the final value

This example shows how to achieve this:

var x = 0;
let myArray = [];
while(x<6) {
  ++x; // We want x to start at 1
  myArray.push(x) // Add the new value of x into the array
}
const string = '(' + myArray.join(',') + ')'; // Format the output string by joining the array in a csv format and wrapping with brackets.
document.write(string);