我有一个单页的广告系列网站，应该收集 PageView 和 LEAD Facebook定位的事件数据高级匹配。
I have a one-pager campaign site which should collect PageView and LEAD event data for Facebook targeting with "advanced matching".
对于 PageView ，我需要在页面加载时初始化Pixel。对于高级匹配，我需要为初始化脚本提供用户数据 - 但是，在用户提交数据后，我只有用户数据可用，即 LEAD 事件应该是已发送。
For PageView, I need to initialize the Pixel on page load. For advanced matching, I need to provide user data for initialization script — however, I only have user data available after user has submitted the data, which is when the LEAD event should be sent.
是否可以为初始化脚本提供指向发送 LEAD 活动？帮助页面提示，但所有示例都有例如电子邮件参数以纯文本或sha256哈希的形式提供;不是JS变量，也不是文本指针。
Is it possible to provide the initialization script with a "pointer" to a javascript variable that is used when sending the LEAD event? Help page hints at this, but all the examples have e.g. email parameter provided as plain text or sha256 hash; not as JS variable nor as a textual pointer to one.
来自与Pixel进行高级匹配帮助页面：
要启用此功能，请修改默认的FB像素代码，将数据传递到像素初始化调用中。
To enable this feature, modify the default FB pixel code to pass data into the pixel init call. fbq('init', '<FB_PIXEL_ID>', { em: '{{_email_}}', // Data will be hashed automatically via a dedicated function in FB pixel ph: '{{_phone_number_}}', fn: '{{_first_name_}}' .... })
在上面的示例中，您需要将电子邮件，phone_number， first_name替换为您网站上变量的名称捕获这些数据。
In the example above, you will need to replace email, phone_number, first_name with the names of the variables on your website that capture this data.
假设我有 user_email 变量范围为 fbq-init ：
var user_email = '';稍后，在提交表单后，此变量将填充为
Later, after the form is submitted, this variable will be populated like
user_email = "john@example";我应该如何在 fbq 中引用变量？ ？ （1）喜欢这个？
How should I reference the variable in fbq? (1) Like this?
fbq('init', 123456, { em: '{{_user_email_}}' });（2）或者像这样？
fbq('init', 123456, { em: 'user_email' });（3）或者我应该只提供变量：
fbq('init', 123456, { em: user_email }); // nb: user_email === false when this is run（4）或者我应该初始化没有任何匹配数据的像素，以后再丰富它？ （如何？）
(4) Or should I initialize the pixel without any matching data and later enrich it? (How?)
一位声誉良好的广告代理商向我发送了提交变量名称的说明，如我的示例2所示，但帮助页面提示为1但未实际提供任何现实世界的例子。
A reputable ad agency sent me with instructions to submit the name of the variable as in my example 2, but the help page hints at 1 without actually providing any real world examples.
我尝试了所有选项1-3，似乎变量不会重新获得初始化后，在后续的 fbq（'track'，...）; 调用中进行评估。如果 user_email 以空白开头，则所有事件都不会包含散列用户数据。
I tried all the options 1–3, and it seems variables won't get re-evaluated in subsequent fbq('track', …); calls after the initialization. If user_email is blank to start with, none of the events will include hashed user data.
此外即使我从有效的电子邮件开始 user_email =john@example; （也尝试过真正的域而不是example）只有方法3可以工作 - 但是，正如预期的那样，这不是动态的，即。如果 user_email 更改哈希值不会。
Moreover even if I start with a valid email user_email = "john@example"; (also tried real domains instead of example) only method 3 will work — but, as expected, this is not dynamic, ie. if user_email changes the hashes won't.
就好像没有字符串变量替换开始使用。
It is as if there is no string-variable replacement to begin with.
更合适的问题是：如何在像素初始化后提交高级匹配的用户数据？而不是尝试使初始化延迟/动态。
Would the more proper question be: how do I submit user data for advanced matching after the pixel initialization? Instead of trying to make the initialization lazy/dynamic.
推荐答案作为解决方法它是可以通过javascript加载像素（图片）来生成带有电子邮件用户数据的 Lead 事件：
As a workaround it is possible to generate a Lead event with email user data by loading the pixel (image) via javascript:
// here the user email is unknown, so PageView is generated without email fbq('init', 123456, {}); fbq('track', 'PageView'); // Later the form is submitted via ajax, so the user email is known $.ajax(…).done(function(data) { // I decided to sha256 hash the email address in the backend and return it for the javascript handler var pixel = document.createElement('img'); pixel.src = 'www.facebook/tr/?id=123456&ev=Lead&ud[em]=' + data; document.body.appendChild(pixel); // confirmed by the Pixel helper Chrome extension, this does generate a valid tracking event // (ironically, we're loading the noscript version via javascript) });当然，纯粹的 fbq 版本会更可取。此外，我还没有意识到可能的缺点，如果有的话。
Of course, a pure fbq version would be more desirable. Also, I'm yet unaware of possible drawbacks, should there be any.
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