domain.bind(callback)
callback
<Function> 回调函数- 返回: <Function> 绑定的函数
返回的函数将是提供的回调函数的封装器。
当调用返回的函数时,抛出的任何错误都会被路由到域的 'error'
事件。
const d = domain.create();
function readSomeFile(filename, cb) {
fs.readFile(filename, 'utf8', d.bind((er, data) => {
// 如果这个抛出,则它也会被传给域。
return cb(er, data ? JSON.parse(data) : null);
}));
}
d.on('error', (er) => {
// 某处发生了错误。如果我们现在抛出,
// 则其会以正常的行号和堆栈消息使程序崩溃。
});
callback
<Function> The callback function- Returns: <Function> The bound function
The returned function will be a wrapper around the supplied callback
function. When the returned function is called, any errors that are
thrown will be routed to the domain's 'error'
event.
const d = domain.create();
function readSomeFile(filename, cb) {
fs.readFile(filename, 'utf8', d.bind((er, data) => {
// If this throws, it will also be passed to the domain.
return cb(er, data ? JSON.parse(data) : null);
}));
}
d.on('error', (er) => {
// An error occurred somewhere. If we throw it now, it will crash the program
// with the normal line number and stack message.
});