Question

js怎么判断各种类型

都有哪些方法啊

Answer 1

    function isType(obj,type){
        return Object.prototype.toString.call(obj) ==="[object "+type+"]";
    }
    console.log(isType([],"Array"));
    console.log(isType(1,"Number"));
    console.log(isType("","String"));
    console.log(isType(new Date(),"Date"));
    console.log(isType(function(){},"Function"));
    console.log(isType(new RegExp(),"RegExp"));
    console.log(isType({},"Object"));
    console.log(isType(true,"Boolean"));
    console.log(isType(null,"Null"));
    console.log(isType(undefined,"Undefined"));
}

Answer 2

typeof(变量)