Of course, you can run loops backward instead of forward, or increment the loop counter by something other than 1, or even eliminate the loop counter completely as you do in a while statement.
The status attribute in the tag is a simple counter field. (Notice this value is used on the next line in a ternary statement that sets the CSS style to either even or odd.)
标记的 status 属性是个简单的计数器字段（请注意这个值用在下一行的 ternary 语句中，用来将 CSS 样式设为 even 或 odd）。
3
Assembly language instruction sequence perform arithmetic, and jump instruction by changing the program counter value to execute the conditional statement and circular statement.