在javascript函数中动态创建静态变量

Question

How does one go about dynamically creating a function in javascript, but have a variable be "dynamically hardcoded" (?). Preferably without using eval() .

I thought this would be the cleanest way to pass async.parallel() a few parameters in nodejs without having to bind objects.

function makeFunction( param1){

  return function(){
      alert(param1); 
  }

}

Actual Output from console.log( makeFunction("Hello World") );

return function(){ alert(param1); }

Desired Output from console.log( makeFunction("Hello World") );

return function(){ alert("Hello World"); }

Answer 1

function makeFunction(param1){
  return new Function('alert(\'' + param1 + '\');')
}

console.log(makeFunction('helloWorld').toString())

only like that. new Function is a little bit "evaly" but in fact it's much better (or less evil).

Answer 2

I don't feel it'd be better than using eval , but probably this would be what you want:

function makeFunction(param1) {
    var F=function () {
        alert(param1);
    };

    var text=['"', '"'].join(param1);
    text=String.prototype.replace.call(F, 'param1', text);
    text=['return ', ';'].join(text);
    return (new Function(text))();
}