1.for循环
for(循环变量赋初值;循环条件;循环变量增值){循环语句;}
2.while循环
while(循环条件){循环体;}
3.do…while 循环
do{循环体;}while(循环条件);
console.log(…); 以日志的形式在控制台输出结果!
<script
>
var count
= 0;
for (var i
= 1; i
<= 100; i
++) {
if (i
% 3 == 0 && i
% 7 == 0) {
console
.log(i
);
count
++;
}
}
console
.log(count
);
console.log显示如下:
循环嵌套
演示案例9*9乘法表
<style
>
table
{
border
-collapse
: collapse
;
border
-color
: red
;
}
</style
>
<script
>
document
.write("<table border='1px solid red' cellspacing='0' cellpadding='8px'>");
document
.write("<caption>九九乘法口诀表</caption>");
for (var i
= 1; i
<= 9; i
++) {
document
.write("<tr>");
for (var j
= 1; j
<= i
; j
++) {
document
.write("<td>");
document
.write(j
+ "*" + i
+ "=" + (j
*i
) + " ");
document
.write("</td>");
}
document
.write("</tr>");
}
document
.write("</table>");
</script
>
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