js中的switch结构的用法

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<!DOCTYPE html><html lang="en"><head>    <meta charset="UTF-8">    <title>switch结构</title></head><body></body><script>    var mouth = parseInt(prompt("请输入您要查询的月份："));    /*switch语句：一旦条件满足，就不再出来，直到遇到break语句    switch (mouth){        case 1:            alert("一季度");            break;  //break关键字不可以省略        case 2:            alert("一季度");            break;        case 3:            alert("一季度");            break;        case 4:            alert("二季度");            break;        case 5:            alert("二季度");            break;        case 6:            alert("二季度");            break;        case 7:            alert("三季度");            break;        case 8:            alert("三季度");            break;        case 9:            alert("三季度");            break;        case 10:            alert("四季度");            break;        case 11:            alert("四季度");            break;        case 12:            alert("四季度");            break;    }*/    //简略后的switch语句    switch (mouth) {        case 1:        case 2:        case 3:            alert("一季度");            break;        case 4:        case 5:        case 6:            alert("二季度");            break;        case 7:        case 8:        case 9:            alert("三季度");            break;        case 10:        case 11:        case 12:            alert("四季度");            break;    }</script></html>
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