js中for循环的用法

用for循环取数组的值

第一种

    <script>
        // 用for循环取数组的值
        function f1(){
            let a = [\'我\', \'是\', \'你\', \'爸\', \'爸\'];
            for (let item in a){
                // console.log(a[item]);
                let s = a[item] + "<br/>";
                document.write(s);
        }
        }
        setInterval(\'f1();\', 500);
    <script/>

第二种

<script>
        function f1(){
            let a = [\'我\', \'是\', \'你\', \'爸\', \'爸\'];
            for (let item=0; item<a.length; item++){
                // console.log(a[item]);
                let s = a[item] + "<br/>";
                document.write(s);
        }
        }
        setInterval(\'f1();\', 500);
</script>

 

 

用for循环取对象的值

    <script>
        //用for循环取对象的值
        function f1(){
            let a = {\'k1\':\'我\', \'k2\':\'是\', \'k3\':\'你\', \'k4\':\'爸\',\'k5\':\'爸\'};
            for (let item in a){
                // console.log(a[item]);
                let s = a[item] + "<br/>";
                document.write(s);
        }
        }
        setInterval(\'f1();\', 500)
    </script>