如何檢查特定字母的輸入值及其計數

Question

我想檢查元音字母的輸入值，然后計算其中的元音數。

我只知道如何檢查元音的輸入，我發現很難知道元音的數量，我希望能夠寫出：“段落包含 6 個元音”。

請查看代碼並提供幫助。

 //Selecting document element const voutText = document.querySelector('#vText'); const voutBtn = document.querySelector('#vSubBtn'); const voutBox = document.querySelector('#vOutput'); const vowelCount = 0; const voutApp = () => { const vowel = ['A','E', 'I', 'O', 'U']; const voutTextView = voutText.value.toUpperCase(); for (i = 0; i < voutText.value.length; i++) { voutBox.innerHTML = i; } if (voutTextView.includes('A')) { alert("Yey! we found vowels, your text contains the vowel sound 'A'"); } else if (voutTextView.includes('E')) { alert("Yey! we found vowels, Your text contains the vowel sound 'E'"); } else if (voutTextView.includes('I')) { alert("Yey! we found vowels, Your text contains the vowel sound 'I'"); } else if (voutTextView.includes('O')) { alert("Yey! we found vowels, Your text contains the vowel sound 'O'"); } else if (voutTextView.includes('U')) { alert("Yey! we found vowels, Your text contains the vowel sound 'U'"); } else { voutBox.innerHTML = 'Your text contains no vowel sound'; } voutText.value = ''; voutBox.innerHTML = `Your text ${voutTextView} contains vowel sounds`;//I have to figure out how to get the vowel counts EG: Your text (Input Value) contains 6 vowels. } voutBtn.addEventListener('click', voutApp);

 <div id="vHead"> <h1>VOUT</h1> <p>Check a word for vowel sounds</p> <input id="vText" type="text" placeholder="Eg: Victor" value="Victor" required> <input id="vSubBtn" type="button" value="Check"> </div> <div id="vOutput"></div>

Answer 1

正則表達式可以匹配元音，然后可以檢查匹配的數量。

 const input = document.querySelector('#vText'); const button = document.querySelector('#vSubBtn'); const output = document.querySelector('#vOutput'); button.onclick = () => { const inputText = input.value; const vowelCount = (inputText.match(/[aeiou]/gi) ?? []).length; output.textContent = `Your text ${inputText} contains ${vowelCount} vowel sounds`; }

 <div id="vHead"> <h1>VOUT</h1> <p>Check a word for vowel sounds</p> <input id="vText" type="text" placeholder="Eg: Victor" value="Victor" required> <input id="vSubBtn" type="button" value="Check"> </div> <div id="vOutput"></div>

Answer 2

其他一些帖子展示了如何縮短代碼以實現此目標。 如果你想保持你所寫的風格，比如使用for循環和alert s 等，那么你可以這樣做：

//Selecting document element
const voutText = document.querySelector('#vText');
const voutBtn = document.querySelector('#vSubBtn');
const voutBox = document.querySelector('#vOutput');

const voutApp = () => {
    const vowel = ['A', 'E', 'I', 'O', 'U'];
    const voutTextView = voutText.value.toUpperCase();

    let vowelCount = 0;
    for (i = 0; i < voutTextView.length; i++) {
        if (vowel.includes(voutTextView[i])) {
            // This would alert whenever it finds a vowel - even multiple of the same
            alert("Yey! we found vowels, your text contains the vowel sound " + voutTextView[i]);
            vowelCount++;
        }
    }

    if (vowelCount > 0) {
        voutBox.innerHTML = "The passage contains " + vowelCount + " vowel sounds";
    } else {
        voutBox.innerHTML = "Your text contains no vowel sound";
    }
}

voutBtn.addEventListener('click', voutApp);

Answer 3

字符串是可迭代的JS，所以你可以使用傳播接線員給人物和檢查的數組，如果它是一個vowel與否，如果它是在vowel陣列使用包括方法

 //Selecting document element const voutText = document.querySelector('#vText'); const voutBtn = document.querySelector('#vSubBtn'); const voutBox = document.querySelector('#vOutput'); let vowelCount = 0; const voutApp = () => { const text = voutText.value; const vowel = ['A', 'E', 'I', 'O', 'U']; [...text].forEach(ch => vowel.includes(ch.toUpperCase()) ? vowelCount++ : "") voutBox.innerHTML = `Your text ${vowelCount} contains vowel sounds`; //I have to figure out how to get the vowel counts EG: Your text (Input Value) contains 6 vowels. } voutBtn.addEventListener('click', voutApp);

 <div id="vHead"> <h1>VOUT</h1> <p>Check a word for vowel sounds</p> <input id="vText" type="text" placeholder="Eg: Victor" required> <input id="vSubBtn" type="button" value="Check"> </div> <div id="vOutput"></div>

Answer 4

檢查這個

 function voutApp(){ const voutText = document.getElementById('vText'); const voutBox = document.getElementById('vOutput'); const vowel = ['A','E', 'I', 'O', 'U']; let vowelCount = 0; let val = voutText.value; let msg1 = 'Yey! we found'; let vfound = []; for (let i=0; i<val.length; i++) { let curChar = val[i].toUpperCase(); if( vowel.indexOf(curChar) !== -1 ){ vowelCount += 1; vfound.push(curChar); } } if( vowelCount > 0 ){ voutBox.innerHTML = msg1+' '+vowelCount+' vowels. your text contains the vowel sound '+vfound; }else{ voutBox.innerHTML = 'Your text contains no vowel sound'; } }

 <div id="vHead"> <h1>VOUT</h1> <p>Check a word for vowel sounds</p> <input id="vText" type="text" placeholder="Eg: Victor" value="Victor" required> <input id="vSubBtn" type="button" value="Check" onclick="voutApp()"> </div> <div id="vOutput"></div>