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1switch/case
<!--分支比较少时用if else解决,多时用switch case语句解决--> <script> let mon = prompt("请输入月份:"); mon = parseInt(mon); switch (mon) { case 1: case 3: case 5: case 7: case 8: case 10: case 12: console.log(mon+"月是31天"); break; case 4: case 6: case 9: case 11: console.log(mon+"月是30天"); break; case 2: console.log(mon+"月是28&29天"); break; default: console.log("请输入正确的月份!"); }
2do/while
<script type="text/javascript"> /*do while 循环*/ let max = prompt("计算0-x的整数和,请输入x(若输入小数则只取整数部分)"); max = parseInt(max); let num = 0; let sum = 0; do { sum += num; num++; } while (num<=max){ console.log(sum); } </script>
3break/continue
<!--break作用与switch,和循环语句,用于跳出或者结束-->
<!--continue只作用于循环结构,继续循环用的-->