​x
 
<!DOCTYPE html>
<html>
<body>
​
<h1>JavaScript Array.forEach()</h1>
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<p>为每个元素调用一次函数。</p>
​
<p id="demo"></p>
​
<script>
var txt = "";
var numbers = [45, 4, 9, 16, 25];
numbers.forEach(myFunction);
document.getElementById("demo").innerHTML = txt;
​
function myFunction(value, index, array) {
  txt = txt + value + "<br>"; 
}
</script>
​
</body>
</html>
​