javascript 在 Node.Js Express 中，“res.render”是否结束了 http 请求？
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In Node.Js Express, does "res.render" end the http request?
提问by TIMEX
So, only do "res.render" when you are sure that everything has finished, right? Because it ends the request and shoots out a webpage.
所以，只有当你确定一切都已经完成时才执行“res.render”，对吗？因为它结束请求并发出一个网页。
回答by mak
If you don't provide a callback to res.render(view[, options[, fn]])it will automatically give a response with 200 HTTP Status and Content-Type: text/html
如果你不提供回调，res.render(view[, options[, fn]])它会自动给出一个带有 200 HTTP Status 和 Content-Type: text/html 的响应
res.render('view', {}, function() {
while (true); // should block
});
res.render(view[, options[, fn]])
Render view with the given options and optional callback fn. When a callback function is given a response will not be made automatically, however otherwise a response of 200 and text/html is given.
res.render(view[, options[, fn]])
使用给定的选项和可选的回调 fn 渲染视图。当给出回调函数时，不会自动做出响应，否则会给出 200 和 text/html 的响应。
回答by entropo
With the current github master commit, this is res.renderin lib/view.js:
使用当前的github master commit，这是res.render在lib/view.js 中：
/**
* Render `view` with the given `options` and optional callback `fn`.
* When a callback function is given a response will _not_ be made
* automatically, however otherwise a response of _200_ and _text/html_ is given.
*
* Options:
*
* - `scope` Template evaluation context (the value of `this`)
* - `debug` Output debugging information
* - `status` Response status code
*
* @param {String} view
* @param {Object|Function} options or callback function
* @param {Function} fn
* @api public
*/
res.render = function(view, opts, fn, parent, sub){
// support callback function as second arg
if ('function' == typeof opts) {
fn = opts, opts = null;
}
try {
return this._render(view, opts, fn, parent, sub);
} catch (err) {
// callback given
if (fn) {
fn(err);
// unwind to root call to prevent
// several next(err) calls
} else if (sub) {
throw err;
// root template, next(err)
} else {
this.req.next(err);
}
}
};
