为什么console.log不能在JSC环境中工作,但它可以在Safari的调试控制台中运行

Question

当我使用系统库中提供的JSC(JavaScriptCore)引擎时,它的行为与使用Safari的调试控制台时不同

$ /System/Library/Frameworks/JavaScriptCore.framework/Versions/A/Resources/jsc
>>> console.log("hello");
Exception: TypeError: undefined is not an object (evaluating 'console.log')

当console.log("hello");在Safari中工作完全正常.

Answer 1

TL; DR

var Console = function () {
    this.log = function(msg){ debug(msg) }; 
};
var console = new Console();
console.log("hello");

Safari创建一个控制台对象,该对象在调试控制台中可用,但在JSC环境中不可用.请在此处查看Safari的控制台文档

添加我自己的包装JSC调试方法的控制台对象解决了我的问题:

$ /System/Library/Frameworks/JavaScriptCore.framework/Versions/A/Resources/jsc
>>> var Console = function () {
...     this.log = function(msg){ debug(msg) };
... };
undefined
>>> var console = new Console();
undefined
>>> console.log("hello");
-> hello
undefined