关于以下这些变量定义的一些疑惑 var a={},b=[],c=function(){},d=(function(){}){};
- 1 var obj1={
pro1:2,
pro2:"ss",
pro3:function(){}
};
typeof obj1
for(var pp in obj1){
console.log("typeof "+pp+ " is "+(typeof pp)+" value "+ obj1[pp]);
}
/******
object
typeof pro1 is string value 2
typeof pro2 is string value ss
typeof pro3 is string value function () {
return 1;
}
***/
- 2 var obj2=["a","数组？",1,function(){}];
typeof obj2
for(var pp in obj2){
console.log("typeof "+pp+ " is "+(typeof pp)+" value "+ obj2[pp]);
}
/××××××××
object
typeof 0 is string value a
typeof 1 is string value 数组？
typeof 2 is string value 1
typeof 3 is string value function () {
return "sping";
}
××××/
- 3 var obj3=function(){return 4;};
typeof obj3
obj3()
/**
function
4
**/
- 4 var obj4=(function(im)
{
var im=im||"ss";
return im;
})();
typeof obj4
obj4
obj4()
/***
string
ss
error
***/