怎么知道，JS对象属性的值在哪一行被改变了

Question

我正在使用object.watch方法。

    obj[i].position.watch("x", function (id, oldval, newval) {
        console.log( "Object " + id + " changed from " + oldval + " to " + newval );
        return newval;
    });

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/watch?redirectlocale=en-US&redirectslug=JavaScript%2FReference%2FGlobal_Objects%2FObject%2Fwatch#Examples

我如何找到我的代码（哪个.js文件，哪一行）这个值发生了变化？

Answer 1

尝试添加行debugger;并检查调用堆栈 - 或者只是在console.log()行设置断点。