我不知道返回中间字母颜色被修改的单词的正确结构。我使用拆分将段落中的所有单词保存在数组中，但是我必须修改这些单词中的每个单词，并用红色的中间字母显示它们。调查，我想我可以使用slice方法来修改字体颜色。这是我的代码：
HTML
<body>
<textarea id="text">JavaScript is the Programming Language for the Web, JavaScript can update and change both HTML and CSS, JavaScript can calculate, manipulate and validate data</textarea>
<div class="show">
<h3 id="txt"></h3>
</div>
<div class="control-box">
<button type="button" name="button" onclick="iniciar()">play</button>
</div>
</body>
</html>
脚本
function iniciar(){
var texto = document.getElementById("text").value;
var palabras = texto.split(/[, ]+/);
var index = 0;
console.log(palabras);
function tester(){
document.getElementById("txt").innerHTML=palabras[index];
var timer = setTimeout(function(){
console.log(timer);
tester();
},550);
console.log(palabras[index]);
if (index>palabras.length-2){
clearTimeout(timer);
}
index++;
}
tester();
}
尝试这种逻辑...
var broken = texto.toArray();
if (broken.length % 2 === 1){
var size = broken.length / 2;
var fixed = broken.toString();
fixed.charAt(size).style.color = 'red';
}
else{
var size = (broken.length / 2);
var fixed = broken.toString();
fixed.charAt(size).style.color = 'red';
fixed.chatAt(size - 1).style.color = 'blue';
}
这应该工作
这里是更新的Javascript代码，返回数组中的每个单词，中间字母为红色。
function iniciar(){
var texto = document.getElementById("text").value;
var palabras = texto.split(/[, ]+/);
console.log(palabras);
palabras.forEach(function(value, index){
var wordstr = value;
var wordLength = value.length; //get length of word
var centerOfWord = (wordLength/2).toFixed(0); //get centerofword
var middleLetter = wordstr.substring(parseInt(centerOfWord) - 1, parseInt(centerOfWord)); //get middle letter of word
wordstr = wordstr.replace(middleLetter, "<span style='color:red'>"+ middleLetter +"</span>"); //make middle letter color red
setTimeout(function(){
console.log(wordstr);
document.getElementById("txt").innerHTML= wordstr; //show word
}, 1000*index);
});
}
希望这对您有用。