如何在 JavaScript 中使用 charAt 检查一个值

Question

我对 JavaScript 很陌生。目前，我正在做一个程序，我想将文本翻译成“rovarspra​​cket”。即）将每个辅音加倍，并在其间放置一个“o”。例如： ， translate("this is fun") 应该返回字符串 "tothohisos isos fofunon" 。我无法得到想要的结果。帮助我学习。

这是我尝试过的以下代码。

<button type="button" onclick="translate('de')">try it</button>
    <h2 id="ad" />
<script>
            function translate(t)
                {//alert(t.length);exit;
                    var l=t.length;
                    var v=["a","e","i","o","u",""];
                    var b="";
                    for(var i=0;i<l;i++)
                        { //alert(i);exit;
                            var c=t.charAt[i];alert(c);
                            if(v.indexOf(c)!=-1)
                            {   
                                b=(b+(c));
                            }
                            else
                            {
                                b=(b+(c="o"+c));
                            }
                        }

                    document.getElementById("ad").innerHTML=b;
                }

        </script> 

Answer 1

我冒昧地为您简化了功能：

var str = "this is fun",
    arr = str.split(''); // Split the string into an array of separate characters.
    mapped = arr.map(function(c){
        if(["a","e","i","o","u"," "].indexOf(c) == -1) // If the character is a consonant
            return c + 'o' + c; // replace it,
        return c;               // otherwise, just keep the current character.
    }),
    result = mapped.join('');   // Rebuild the string

console.log(result);

或者，更紧凑一点：

var str = "this is fun",
    result = str.split('').map(function(c){
        return (["a","e","i","o","u"," "].indexOf(c) == -1) ? (c + 'o' + c) : c;
    }).join('');

console.log(result);

Answer 2

这是你可以做的。

function translate(input) {
  var outputString = [];
  var vowels = ['a', 'e', 'i', 'o', 'u'];
  input.split("").forEach(function(charValue) {

    if (vowels.includes(charValue) || charValue == ' ') {
      outputString.push(charValue);
    } else {
      outputString.push(charValue + 'o' + charValue);
    }
  });

  document.querySelector("#output").innerHTML = outputString.join("");
}

div {
  padding: 10px;
}

<button type="button" onclick="window.translate('this is fun')">try it</button>
<div id="output"></div>

如果您正在寻找具有 charAt 函数的解决方案，这里就是。

function translate(input) {

  var outputString = [],
    vowels = ['a', 'e', 'i', 'o', 'u'];

  for (var idx = 0; idx < input.length; idx++) {
    var currentChar = input.charAt(idx);
    if (vowels.indexOf(currentChar) === -1 && currentChar != " ") {
      outputString.push(currentChar + "o" + currentChar);
    } else {
      outputString.push(currentChar);
    }
  }
  console.log(outputString.join(""));
}
translate("this is fun");