var myGrade = {};//创建一个Object
var collegeAlgebra = {
level: "freshman",
difficulty: "hard",
expectedGrade: 98,
textbook: function(){
console.log("college Algebra for freshman is the required text");
}
}
delete collegeAlgebra .level;//删除collegeAlgebra 的level属性
var collegeAlg = new Object; //创建一个Object
collegeAlg.level = "freshman";
collegeAlg.textbook = function(){
console.log("college Alg for freshman is the required text");
}
//collegeAlg["textbook"] = function(){console.log("college Alg for freshman is the required text");}
console.log(myGrade);
console.log(collegeAlgebra);
collegeAlgebra.textbook();
console.log(collegeAlg);
collegeAlg.textbook();
