javascript - 匿名回调函数抛出错误，使得像forEach一样遍历数组

Question

function each(collec,function(){
    for(var key in collec){
      console.log(collec[key]);
    }
  }
);

------------------------------------------
Line 1: Expected an identifier and instead saw 'function' (a reserved word).
Line 1: Expected ')' to match '(' from line 1 and instead saw '('.
Line 1: 'function closure expressions' is only available in Mozilla JavaScript extensions (use moz option).
Line 1: Expected an identifier and instead saw ')'.
Line 6: Expected an identifier and instead saw ')'.
Line 6: Expected an assignment or function call and instead saw an expression.

Answer 1

我们在调用函数时传递参数，但这里

function each(collec,function(){
    for(var key in collec){
      console.log(collec[key]);
    }
  }
);

您正在声明一个函数，因此需要指定参数，如下所示

function each(collec , temp){
   .... fxn code
}

What is the difference between arguments and parameters in javascript?