直角三角形
<script type="text/javascript">
for(var i=1;i<=8;i++){
for(var j=1;j<=i;j++){//j 指的是*的个数
document.write("*");
}
document.write('<br>');
}
document.write("<hr />");//增加一个分割线
document.write("<hr />");//增加一个分割线 </script>
直角三角形
倒直角三角形
<script type="text/javascript">
for(var i=1;i<=8;i++){ //控制行
for(var j=1;j<=8-i;j++){ //控制列
document.write("*");
} document.write('<br>');
}
document.write("<hr />");
document.write("<hr />");//增加一个分割线
</script>
倒直角三角形
斜三角形
<script type="text/javascript">
for (var i = 1; i <= 6; i++) {
for (var j = 1; j <= 6-i; j++) {//j 指的是空格的个数
document.write(" ");
} for (var k = 1; k <= i; k++) {
document.write("*");
}
document.write("<br />");
}
document.write("<hr />");
</script>
斜三角形
等腰三角形
<script type="text/javascript">
for (var i = 1; i <= 6; i++) {
for (var j = 1; j <= 6-i; j++) {//j 指的是空格的个数
document.write(" ");
} for (var k = 1; k <= i; k++) {
document.write("*");
}
document.write("<br />");
}
document.write("<hr />");
document.write("<hr />");
</script> <script type="text/javascript">
for (var i= 1; i <= 5; i++) {
for (var j = 1; j <= 5-i; j++) {
document.write(" ");
} for (var k = 1; k <= i*3-2; k++) {//i*3-2越大,三角形越宽
document.write("*");
}
document.write("<br />");
}
document.write("<hr />");
document.write("<hr />");
</script>
等腰三角形
菱形
<script type="text/javascript">
for (var i = 1; i <= 5; i++) {
for (var j = 1; j <= (5-i); j++) {
document.write(" ");
} for (var k = 1; k <= i*2-1; k++) {
document.write("*");
}
document.write("<br />");
}
for (var i = 1; i <= 4; i++) {
for (var j = 1; j <= i; j++) {
document.write(" ");
}
for (var k = 1; k <= (4-i)*2+1; k++) {
document.write("*");
}
document.write("<br />");
}
document.write("<hr />");
document.write("<hr />");
</script> <!--<div style="text-indent:0.5em">-->
<script type="text/javascript">
for (var i = 1; i <= 5; i++) {
for (var j = 1; j<= (5-i); j++) { //j 指的是空格的个数
// document.write(" ");
document.write(j);
} for (var k= 1; k <= i*2-1; k++) {
document.write("*");
}
document.write("<br />");
}
for (var i = 1; i<= 4; i++) {
for (var j = 1; j<= i; j++) {
document.write(" ");
}
for (var k = 1;k <= (4-i)*2+1; k++) {
document.write("*");
}
document.write("<br />");
}
document.write("<hr />");
document.write("<hr />");
</script>
<!--</div>-->
菱形
99乘法表
<script type="text/javascript">
for(var n=1;n<=9;n++) { //控制行
for (var m = 1; m <= n ; m++) { //控制列
var b = m * n;
document.write(m + "x" + n + "=" + b + " ");
} document.write('<br/>');
document.write('<br/>');//为了增加行与行的间距
} document.write("<hr />");//增加一个分割线
</script>
9*9乘法表