{ "name": "zhangsan", "age": 18, "gender": "male" } { "students": [ { "firstName": "san", "lastName": "zhang" }, { "firstName": "si", "lastName": "li" }, { "firstName": "wu", "lastName": "wang" } ] } arrayObject.concat(arrayX, arrayX, ..., arrayX); var a = [1, 2, 3]; var b = [4, 5, 6]; var c = ["one", "two", "three"]; console.log(a.concat(b, c)); // 打印结果为：[1, 2, 3, 4, 5, 6, "one", "two", "three"] var a = [1, 2, 3, 4]; a.reverse(); console.log(a); // a 数组变成：[4, 3, 2, 1]。 arrayObject.slice(start, end); // strat 值是必需的，规定从何处开始选取 // end 值可选，规定从何处结束选取，如果没有设置，默认为从 start 开始选取到数组后面的所有元素 var a = [1, 2, 3, 4, 5, 6]; a.slice(2, 5); // 结果为[3, 4, 5]，另外需要注意的是该方法不会修改数组，只是返回一个子数组，a 数组还是 [1, 2, 3, 4, 5, 6] arrayObject.splice(start, deleteCount, options); // start 值是必需的，规定删除或替换项目的位置 // deleteCount 值是必需的，规定要删除的项目数量，如果设置为 0，则不会删除项目 // options 值是可选的，规定要替换的新项目 // 和 slice() 方法不同的是 splice() 方法会修改数组 var a = [1, 2, 3, 4, 5, 6]; a.splice(2, 2, "abc"); a; // 最终 a 数组变成了[1, 2, "abc", 5, 6] arrayObject.sort(sortby); // sortby 是可选的，规定排序顺序，必需是函数。如果没有参数的话，将会按照字母顺序进行排序，更准确的说是按照字符编码（可自行百度了解）的顺序进行排序。如果想按照其他标准进行排序，则需要提供比较函数 stringObject.charAt(index); // 字符串中第一个字符的下标是 0。如果参数 index 不在 0 与 string.length 之间，该方法将返回一个空字符串 var str = "Hello world!"; document.write(str.charAt(2)); // 以上代码输出为 l stringObject.charCodeAt(index); // 字符串中第一个字符的下标是 0。如果 index 是负数，或大于等于字符串的长度，则 charCodeAt() 返回 NaN var str = "Hello world!"; document.write(str.charCodeAt(2)); // 以上代码输出为 l08 var student = { name: "zhangsan", age: 18, gender: "male", sayHi: function() { console.log("hi,my name is " + this.name); } }; student.name; student.age; student.gender; // 调用对象的属性 student.sayHi(); // 调用对象的方法 var student = new Object(); (student.name = "zhangsan"), (student.age = 18), (student.gender = "male"), (student.sayHi = function() { console.log("hi,my name is " + this.name); }); function createStudent(name, age, gender) { var student = new Object(); student.name = name; student.age = age; student.gender = gender; student.sayHi = function() { console.log("hi,my name is " + this.name); }; return student; } var s1 = createStudent("zhangsan", 18, "male"); function Student(name, age, gender) { this.name = name; this.age = age; this.gender = gender; this.sayHi = function() { console.log("hi,my name is " + this.name); }; } var s1 = new Student("zhangsan", 18, "male"); function Student(name, age, gender) { this.name = name; this.age = age; this.gender = gender; this.sayHi = function() { console.log("hi,my name is " + this.name); }; } var s1 = new Student("zhangsan", 18, "male"); function test() { console.log(this); } test(); // window.test(); var student = { name: "zhangsan", age: 18, gender: "male" }; student.name; // zhangsan delete student.name; student.name; // undefined ![image.png](https://dn-simplecloud.shiyanlou.com/courses/uid1374731-20200618-1592462701194)

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