1 var str1=new String('str1'); 2 var str2='str2'; 3 console.log(typeof str1);//object 4 console.log(typeof str2);//string 5 console.log(str1 instanceof String);//true 6 console.log(str2 instanceof String);//false 7 console.log(str1.constructor==String);//true 8 console.log(str2.constructor==String);//true 9 10 var a = ['hello','world']; 11 console.log(typeof a);//object 12 console.log(a.toString());//hello,world 13 console.log(Object.prototype.toString.call(a));//[object Array] 14 console.log(Array.prototype.isPrototypeOf(a));//true 15 console.log(Array.isArray(a));//true 16 console.log(a instanceof Array);//true 17 console.log(a instanceof Object);//true 18 console.log(a.constructor==Array);//true 19 console.log(a.constructor==Object);//false 20 21 var b = {'hello':'world'}; 22 console.log(typeof b);//object 23 console.log(b.toString());//[object Object] 24 console.log(Object.prototype.toString.call(b));//[object Object] 25 console.log(Object.prototype.isPrototypeOf(b));//true 26 console.log(b instanceof Object);//true 27 console.log(b.constructor==Object);//true