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老师批语：
用slice方法把对象转换为数组 再用forEach遍历对象数组
代码如下:
实例
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>用slice方法将对象转为数组,再用forEach进行遍历</title>
</head>
<body>
<h3>obj1</h3>
<h3>obj2</h3>
<h3>obj3</h3>
<h3>obj4</h3>
<h3>obj5</h3>
<h3>obj6</h3>
<script>
var hh = document.getElementsByTagName('h3');
console.log(hh);
var arr = Array.prototype.slice.call(hh);
arr.forEach(function (value,key) {
if ((key % 2)!== 0){
value.style.backgroundColor = 'blue';
}
});
</script>
</body>
</html>
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