为什么新行无法在此javascript警报窗口中运行？ [英] Why are new lines not working in this javascript alert window?

问题描述

我看到警报窗口和新行有很多不同的问题。大多数是 \ n 被认为是PHP中的新行而不是发送到javascript。

I see quite a few different issues with the alert window and new lines. Most are that the \n is considered a new line in PHP rather than getting sent to javascript.

In在我的情况下，字符串在新窗口中输出，显示 \ n 。我只是尝试通过jsfiddle将 \ n 写入一个警告框，这很有用，所以它一定是我做事的方法......

In my case, the string is being outputted in a new window showing \n. I just tried actually writing \n into an alert box via jsfiddle, and that worked, so it must be my method of doing things...

这是返回控制台的字符串。你可以看到，\ n肯定在那里：

Here is the string returned to console. as you can see, the \n is definitely there:

用户名是必需的\ n密码是必需的\ nEmail是必需的\ nPhone是必需的\ nCardnumber是必需的

然而，它显示如下：

为什么会这样？我认为它可能与数据类型有关，因为它是从 $返回的.ajax

Why is this happening? I think it may have something to do with the data type, as it is returned from $.ajax

if (canAjax && !try_ajax) { 
    e.preventDefault();
    $.ajax({
        type: "POST", 
        url: "mobilesubmit.php",
        data: {"use_ajax": true, "formdata": $("#register_form").first().serializeArray()},
        success: function(data) {

            // This stupid thing should make new lines!
            alert(data);

            console.log(data);
        },
        error: function (request, status, error) {
            try_ajax = true;
            $("#register_form").submit();
        }
    });
}

推荐答案

如果您的控制台日志正在显示 \ n 而不是新行，则表示 \ 在原始字符串中转义...

If your console log is showing \n rather than a new line, then it means the \ is escaped in the original string...

console.log(1,"\\n\\n");
console.log(2,"\n\n");

解决方案

使用 .replace（）用换行符交换 \ n

console.log(3,"\\n\\n".replace(/\\n/g,"\n"))

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