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var data = [5,6,7,8];
data.forEach(function(value,index,array){
  console.log(value * value);//25 , 36, 49, 64
});

var members = [
  'kyosuke',
  'takazudo',
  'yomotsu'
];
var html = '';

// 配列の各要素の値をli要素の値とする
members.forEach(function (member) {
  html += '<li>' + member + '</li>';
});

// 生成したli要素のHTMLをページ上に表示
document.querySelector('ul').innerHTML = html;