javascript function to get variable type_javascript skills

This function requires writing a little code to implement. The following function can get the type of a variable. When calling, pass a variable in and it will return the variable type described in string form.

Copy code The code is as follows:

//Get the type of x and return the type name
function getType(x) {
//If x is null, return null
if (x == null) return "null";
var t = typeof x;
//If If x is a simple type, the return type name
if (t.toLocaleLowerCase() != "object") return t;
//Call the toString method of the object class to get the type information
//object.toString The method returns information similar to this [object class name]
t = Object.prototype.toString.apply(x).toLowerCase();
//Intercept the class name part of the return value of the toString method
t = t.substring(8, t.length - 1);
if (t.toLocaleLowerCase() != "object") return t;
//Check that x is indeed object type
if (x. constructor == Object) return t;
//Get the type name from the constructor
if (typeof x.constructor == "function")
return getFunctionName(x.constructor);
return " unknow type";
}
//Get the function name
function getFunctionName(fn) {
if (typeof fn != "function") throw "the argument must be a function.";
var reg = /W*functions ([w$] )s*(/;
var name = reg.exec(fn);
if (!name) {
return '(Anonymous) ';
}
return name[1];
}