Question

为什么会返回错误？在我头上的标签......

var movieArray = [
["Everything is Illuminated", "0", ""],
["The Girl Who Leapt Through Time (Toki wo kakeru shojo)", "1", "<ol><li><span class=\"bold quote_actor\">Kosuke Yoshiyama: </span><span class=\"line\">It&#039;s not that rare. Many girls do it at your age.</span></li>                                                </ol>"],
["Freedom Writers", "0", ""],
["Inside Man", "0", ""]
];

function checkAnswer(this.value) {
    if (this.value == 0) {
        alert ("Wrong answer!");
    } else {
        alert ("Correct Answer!");
    }

}

身体......

<p><a id="0" class="btn btn-primary btn-large" value="0" onclick="checkAnswer(this.value)">Everything is Illuminated</a></p>
<p><a id="1" class="btn btn-primary btn-large" value="1" onclick="checkAnswer(this.value)">The Girl Who Leapt Through Time (Toki wo kakeru shojo)</a></p>

错误是checkAnswer（）未定义。怎么样？

感谢。

Answer 1

您忘记通过添加反斜杠

来逃避数组元素中的"

var movieArray = [
    ["Everything is Illuminated", "0", ""],
    ["The Girl Who Leapt Through Time (Toki wo kakeru shojo)", "1", "<ol><li><span class=\"bold quote_actor\">Kosuke Yoshiyama: </span><span class=\"line\">It&#039;s not that rare. Many girls do it at your age.</span></li>                                                </ol>"],
    ["Freedom Writers", "0", ""],
    ["Inside Man", "0", ""]
    ];

function checkAnswer(arg1) {
    if (arg1 == 0) {
        alert("Wrong answer!");
    } else {
        alert("Correct Answer!");
    }

}

其次this.value应该在调用checkAnswer（）时传递，而不是在defitinion时传递

Answer 2

每个人如何错过参数列表中的this.value？它应该是标识符，例如myvalue。这就是未定义checkAnswer的原因。

现在，对于其余代码，您不能在this函数中使用checkAnswer，因为它将引用全局对象，而不是链接。此外，链接不支持value属性，因此您需要使用getAttribute或仅将值放在onClick事件中。

function checkAnswer(myval) {
    if (myval == 0) {
        alert ("Wrong answer!");
    } else {
        alert ("Correct Answer!");
    }
}

<p><a class="btn btn-primary btn-large" onclick="checkAnswer(0)">Everything is Illuminated</a></p>
<p><a class="btn btn-primary btn-large" onclick="checkAnswer(1)">The Girl Who Leapt Through Time (Toki wo kakeru shojo)</a></p>

我还删除了id属性，因为除了HTML5之外，以数字开头的ID无效（即使那时它们也不是一个好主意，因为旧的浏览器仍然广泛使用，甚至没有他们没有意义）

Answer 3

函数语法错误。

错误：

function checkAnswer(this.value) {

函数语法必须是functionName(formalParameterName)。您正在函数参数中传递对象中的值，这将导致错误。您必须将其更改为function checkAnswer(param)。

为什么我的函数没有定义？

3 个答案: