10. 输出下面的三角形
方式一：
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>Document</title> </head> <body> <script> for(var i=1;i<5;i++){ for(var j=1;j<=((i*2)+1);j++){ document.write("*"); } document.write('\r\n'+"<br>"); } </script> </body> </html>
方式二：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title></title>
<script>
window.onload = function(){
for(var i=1;i<=9;i++){
if(i!=1&&i%2!==0){ //排除偶数行，只显示奇数星星的3 5 7 9行
for(var x=1;x<=i;x++){
document.write("*");
}
document.write("<br/>")
}
}
}
</script>
</head>
<body>
</body>
</html>
