打印等腰三角形javascript

<html>
    <head>
        <script type="text/javascript">
            var n=4;//层数
            for(var i=1; i<=n; i++)
            {
                for(var j=1; j<=2*n-1; j++)
                {
                    if(j<=(n-i) || j>=(n+i)){
                        document.write("&ensp;");//半角空格
                    }
                    else 
                    {
                        document.write("*");
                    }
                }
                document.write("<br/>");
            }
        </script>
    </head>
    <body> 
    </body>
</html>

打印等腰三角形javascript

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