Call function in string javascript

1. Using eval
 var strFun1 = "func1";
 var ret1 = eval(strFun1);
 ret1(1,2,3);
 function func1(a,b,c){
   alert(a);
   alert(b);
   alert(c);
}
1. Using Window property (Recommend)
 var strFun2 = "func2";
 window[strFun2](parmas);
 function func2(data){
   console.info(data);
 }