问题描述
我正在尝试将 console.log 作为纯 JavaScript 中的字符串.我的输入是一个脚本,我不熟悉,我想把console.log中的所有消息收集成一个字符串.
I'm trying to get the console.log as string in pure JavaScript. My input is a script, which I'm not familiar with, and I want to collect all the messages in the console.log into a string.
例如:
function doSomething(){ console.log("start"); console.log("end"); var consoleLog = getConsoleLog(); return consoleLog; } function getConsoleLog(){ // How to implement this? } alert(doSomething());
JSFiddle 链接
请注意,我不需要提醒日志 - 这只是测试功能的一个简单示例.我得对日志的内容做一些操作.
Note that I do not need to alert the log - this is just a simple example of testing the functionality. I'll have to do some operations on the log's content.
推荐答案
你可以在使用之前覆盖 console.log 方法:
You could overwrite console.log method before using it:
var logBackup = console.log; var logMessages = []; console.log = function() { logMessages.push.apply(logMessages, arguments); logBackup.apply(console, arguments); };
使用 apply 和 arguments 保留正确的 console.log 行为,即您可以通过一次调用添加多个日志消息.
Using apply and arguments preserves the correct console.log behaviour, i.e. you can add multiple log messages with a single call.
它将所有新的 console.log 消息推送到 logMessages 数组.
It will push all new console.log messages to logMessages array.