Question

我有一个if else语句来匹配一个字符串，元音和辅音工作正常。我想用switch语句对其进行整理，但是使用match（）不能作为一种情况。我错过了什么？

if else //返回元音：1，辅音：3

function getCount(words) {
  var v,
      c;
    if (words === '' || words === ' ') { 
      v=0;
      c=0;
    } else if(words.match(/[aeiou]/gi)) {
        v = words.match(/[aeiou]/gi).length;
        c = words.replace(/\s|\W/g, '').split("").length - v;
    } else {
        v = 0;
        c = 0;
    }
    return {
      vowels: v,
      consonants: c
    };
}

getCount('test');

开关//返回元音：0，辅音：0

function getCount(words) {
  var v,
      c;
    switch(words) {
      case words.match(/[aeiou]/gi):
        v = words.match(/[aeiou]/gi).length;
        c = words.replace(/\s|\W/g, '').split("").length - v;
        console.log("true");
        break;
      case '':
      case ' ':
        v = 0;
        c = 0;
        break;
      default:
        v = 0;
        c = 0;
    }
    return {
      vowels: v,
      consonants: c
    };
}

getCount('test');

Answer 1

＆＃13;

// Code goes here

function getCount(words) {
  var v,
      c;
    switch(true) {
      case ( words.match(/[aeiou]/gi) !=null ):
        v = words.match(/[aeiou]/gi).length;
        c = words.replace(/\s|\W/g, '').split("").length - v;
        console.log("true");
        break;
      case (words==''):
      case (words==' '):
        v = 0;
        c = 0;
        break;
      default:
        v = 0;
        c = 0;
    }
    return {
      vowels: v,
      consonants: c
    };
}

console.log(getCount('test'));

＆＃13;

Answer 2

您的switch语句需要计算表达式并将结果与每个case语句的值进行比较。

function getCount(words) {
  var v,
      c;
    switch(words.match(/[aeiou]/gi).length > 0) {
      case true:
        v = words.match(/[aeiou]/gi).length;
        c = words.replace(/\s|\W/g, '').split("").length - v;
        console.log("true");
        break;
      default:
        v = 0;
        c = 0;
    }
    return {
      vowels: v,
      consonants: c
    };
}

getCount('test');

如何在switch语句中对字符串使用正则表达式？

2 个答案: