参考文献这个问题 https://stackoverflow.com/questions/1340872/how-to-get-javascript-caller-function-line-number-how-to-get-javascript-caller我正在使用这段代码来查找自定义日志记录函数的调用者的行号：
/**
* eLog - displays calling line number & message & dumps vars as pretty json string
* @param {string} msg - string to display in log message
* @param {any} dispVars - any number of variables (ellipsis , aka Rest parameters) to dump
*/
function eLog(msg:string,...dispVars:any[]){
let caller_line = (new Error).stack.split("\n")[4];
console.log(`eLog->Line#${caller_line}->${msg}->`);
console.log(JSON.stringify((new Error).stack.split("\n"),null,2));
dispVars.forEach(value => {
console.log(JSON.stringify(value,null,2));
});
}
像这样调用：
eLog("eLog Test",this);
虽然这确实做了正确的转储.js文件行#，我需要源行#，.ts电话号码。我怎样才能正确生成这个？
我花了一个晚上的时间完成了这个工作，并想出了一个令我满意的功能。感谢您在入门时提供的帮助 -
将其分离成log.ts
require('source-map-support').install({
environment: 'node'
});
/**
* eLog - displays calling line number & message & dumps vars as pretty json string
* @param {string} msg - string to display in log message
* @param {any} dispVars - any number of variables (ellipsis , aka Rest parameters) to dump
* {@link https://github.com/evanw/node-source-map-support usable by typescript node-source-map-support module}
* {@link https://github.com/mozilla/source-map/ Mozilla source-map library & project}
* {@link http://www.html5rocks.com/en/tutorials/developertools/sourcemaps/ good introduction to sourcemaps}
*/
export function eLog(msg:string,...dispVars:any[]){
/**
* go one line back for the caller
* @type {string}
*/
let stackLine = (new Error).stack.split("\n")[2];
/**
* retrieve the file basename & positional data, after the last `/` to the `)`
*/
//
let caller_line = stackLine.slice(stackLine.lastIndexOf('/'),stackLine.lastIndexOf(')'))
/**
* test for no `/` ; if there is no `/` then use filename without a prefixed path
*/
if ( caller_line.length == 0 ) {
caller_line = stackLine.slice(stackLine.lastIndexOf('('),stackLine.lastIndexOf(')'))
}
//
/**
* filename_base - parse out the file basename; remove first `/` char and go to `:`
*/
let filename_base = caller_line.slice(0+1,caller_line.indexOf(':'));
/**
* line_no - parse out the line number ; remove first `:` char and go to 2nd `:`
*/
let line_no = caller_line.slice(caller_line.indexOf(':')+1,caller_line.lastIndexOf(':'));
/**
* line_pos - line positional - from the last `:` to the end of the string
*/
let line_pos = caller_line.slice(caller_line.lastIndexOf(':')+1);
console.log(`eLog called by ${filename_base} on line# ${line_no} @ char# ${line_pos} said:\n${msg}`);
// print out the input variables as pretty JSON strings
dispVars.forEach(value => {
console.log(JSON.stringify(value,null,2));
});
}
可以通过简单的调用：
eLog("eLog Test",this);
从任何文件只要加载该函数（例如）
import { eLog } from './log'
我希望这对其他人有帮助。
干杯，伙计们。
-埃里克
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