Question

基本上，我试图通过PHP调用Javascript警报。虽然，警报根本不起作用。

这是我的echo语句，动态创建警报

echo "<script>alert('Uploaded file was not in the correct format\n\nExample of the correct format:\nquestion1,answer1,answer2,answer3,answer4\n
question2,answer1,answer2,answer3,answer4\nquestion3,answer1,answer2,answer3,answer4')</script>";

我发现，如果我将警报更改为此，则效果非常好：

echo "<script>alert('Uploaded file was not in the correct format')</script>";

我认为路线有问题。

我将代码更改为此，但仍然没有运气：

echo "<script>alert('Uploaded file was not in the correct format\\nExample of the correct format:\\nquestion1,answer1,answer2,answer3,answer4\\n
question2,answer1,answer2,answer3,answer4\\nquestion3,answer1,answer2,answer3,answer4')</script>";

我收到错误：

SyntaxError: unterminated string literal
[Break On This Error]   

alert('Uploaded file was not in the correct format\nExample of the
------^

createplay.php (line 1, col 6)

有没有人对为什么这不起作用有任何建议？在线搜索范围广泛，无法找到解决方案。

提前致谢！

Answer 1

您的\n个字符被PHP的文字换行符替换。

字符串文字中未转义的文字换行是JavaScript中的错误。

使用\\n向JavaScript发送换行符转义序列。

Answer 2

尝试类似的东西：

    <?
    echo "<script>alert('Uploaded file was not in the correct format\\n\\nExample of the correct format:\\nquestion1,answer1,answer2,answer3,answer4\\n
   question2,answer1,answer2,answer3,answer4\\nquestion3,answer1,answer2,answer3,answer4')</script>";
    ?>

Answer 3

要添加到Quentin的答案，是否会切换单引号和双引号也能解决问题？

Answer 4

在\ n和下一个字符之间放一个空格，它会起作用。我尝试在我的系统上使用你的代码并且它可以工作

为什么我的Javascript警报没有显示？

4 个答案: