如何在 JavaScript 中将 console.log 内容作为字符串获取

2022-01-11 00:00:00 logging console javascript

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.

相关文章