计算语句中的按钮文本

Question

嗨，我试图在语句中评估按钮的文本内容，但实际上没有任何反应。

我的网页：

<div class="app">
<h2 id="question"></h2>
<button class="options" type="button" value="val"><span></span></button>
<button class="options" type="button" value="val"><span></span></button>
<button class="options" type="button" value="val"><span></span></button>
<button class="options" type="button" value="val"><span></span></button>
</br>
<button id="submit" type="button" name="button">Submit</button>
<button id="back" type="button" name="button">Back</button>
</div>
function evaluate() {
// click the submit button
submitBtn.addEventListener('click', function() {
//check if the selected answer is correct
for(i = 0; i < options.length; i++) {
if(options[i].classList.contains('picked').textContent === 6) {
alert('welldone')
}
}
})
}

Answer 1

如果您尝试同时比较按钮文本和类，则可以使用以下代码。请注意，您正在使用===，它也将比较数据类型，因此请将6更改为'6'或将比较运算符从===更改为==。查看此链接，了解有关比较运算符的详细信息

$(document).ready(function () {
var submitBtn = document.getElementById("submit");
submitBtn.addEventListener('click', function () {
//check if the selected answer is correct
var options = document.querySelectorAll('.options');
for (i = 0; i < options.length; i++) {
if (options[i].classList.contains('picked') && options[i].textContent === "6") {
alert('welldone')
}
}
});
});

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.8.0/jquery.min.js"></script>
<div class="app">
<h2 id="question"></h2>
<button class="options picked" type="button" value="val"><span>6</span></button>
<button class="options" type="button" value="val"><span></span></button>
<button class="options" type="button" value="val"><span></span></button>
<button class="options" type="button" value="val"><span></span></button>
</br>
<button id="submit" type="button" name="button">Submit</button>
<button id="back" type="button" name="button">Back</button>
</div>