js基础第三天（for 循环）

<script type="text/javascript">
    for(var n1=0; n1<=10; n1++){    
        console.log(n1);
    }
</script>

<script type="text/javascript">
    for(var n2=1; n2<=2; n2++){
        for(var n1=1;n1<=10; n1++){
            document.write("*");
        };
        document.write("<br/>")
    };
</script>

<script type="text/javascript">
    for(var j=1; j<=9; j++){
        for(var i=1; i==j; i++){
            document.write("*");
        }
        document.write("<br/>")
    }
</script>

<script type="text/javascript">
for(var j=1; j<=9; j++){
    for(var i=1; i<=j; i++){
        document.write(j+"X"+i+"="+j*i+"&nbsp;")
    }
    document.write("<br/>")
}
</script>

<script type="text/javascript">
var　my= new Array()
     my[0]="中"
     my[1]="国"
     my[2]="好"
for(var i in my){
     document.write(my[i]+"<br/>")
}
</script>// 

<script type="text/javascript">
    var arr=["爱","上","纳","斯"];
    var re=("上" in arr); 
    var rs=(3 in arr); //索引值
    document.write(re+"<br/>");
    document.write(rs+"<br/>");
</script>

<script type="text/javascript">
var obj={
    w:"中",j:"国",b:"好"
};
for(var v in obj){
    document.write(v+"<br/>")
}
</script>