Javascript：如何在for循环中删除最后一个逗号

Question

How can I remove the last comma from this function.

   for(var i = 0; i <= 100; i++) { 
          if(i % 2 === 0) { 
            div.innerHTML += l + ","; 
          } 
         else { 
            div.innerHTML += " ";
         }
   } 

Answer 1

First, use arrays instead strings for sum strings, its faster. Second:

var arr = [];
for (var i = 0 ;i <= 100; i+=2) arr.push(l);
dividedThree.innerHTML = arr.join(', ');

Answer 2

Try using and (&&) condition for 100 and show only i value for 100.

 function loop() { var dividedThree = document.getElementById('MY_ID'); for (var i = 0; i <= 100; i++) { if (i % 2 === 0 && i !== 100) { dividedThree.innerHTML += i + ", "; } else if (i === 100) { dividedThree.innerHTML += i; } else { dividedThree.innerHTML += " "; } } } loop(); 

 <p id="MY_ID"> <p> 

Answer 3

function loop {
    for (var i = 0; i <= 100; i++) {
        if (i % 2 === 0) {
            dividedThree.innerHTML += l;
            if (i < 100)
            {
                dividedThree.innerHTML += ",";
            }
        } else {
            dividedThree.innerHTML += " ";
        }
    }
}

Answer 4

does this version work for you?

function loop() {
    var data = '';
    for (var i = 0; i <= 49; i++) { 
        data  += l + ',' + ' ';
    }
    data  += l;
    dividedThree.innerHTML = data;
}

What are you trying to do? where does 'l' come from?