Which is a better way to know the type of a variable in Java Script

This question already has an answer here:

Check if object is array? 38 answers

Difference between instanceof and constructor property 1 answer

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查看Array.isArray（）函数：

Array.isArray(a);

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if(typeof a === 'object' && Array.isArray(a)) {
    //its array
}

UPDATE : the difference

var a = Object.create(Array.prototype);

alert(a instanceof Array);                       //TRUE
alert(a.constructor === Array);                  //TRUE  
if (typeof a === 'object' && Array.isArray(a)) { //FALSE 
    alert(true);
} 
else {
    alert(false);
}

but then you do

var a = new Array();  // or var a = [];  etc

alert(a instanceof Array);                       //TRUE
alert(a.constructor === Array);                  //TRUE  
if (typeof a === 'object' && Array.isArray(a)) { //TRUE 
    alert(true);
} 
else {
    alert(false);
}

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在下面返回一个用户的变量类型

typeof(a)

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