The return value is zero for a successful parse, and non-zero otherwise.

返回值为零，说明是一次成功的解析，否则返回的是非零值。

youdao

If the method on the server-side component has a non-void return value, that value is passed into the callback function as its only argument.

如果服务器端组件上的方法具有非空返回值，该值就会作为其惟一的实参传递进此回调函数。

youdao

If the function succeeds, the return value is non-zero.

如果函数成功，则返回值非零。

youdao

Thus despite the smaller paycheck, the non-greedy CEO would return less value to shareholders.

FORBES: Musings: Why Shareholders like Greedy CEOs