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Home > List of blog posts > 数组，对象，传参解构; 访问器属性的get,set操作
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数组，对象，传参解构; 访问器属性的get,set操作
小丑0o鱼
Original
622 people have browsed it
  1.  <!-- 函数传参:永远都是值传递 -->
  2.     <script>
  3.         const f1 = (x) => (x = 10);
  4.         let m = 5;
  5.         // m:入参,当前传入的是一个基本类型，原始类型，整数
  6.         f1(m);
  7.         console.log("m = %d", m);
  8.         const f2 = (x) => (x.a = 10);
  9.         let o = {
  10.             a: 5,
  11.             b: 6
  12.         }
  13.         f2(o);
  14.         console.log('o.a = ', o.a);
  15.         // 这里虽然o.a的属性被修改了，但不是更新，
  16.         // 模板字面量和标签函数
  17.         let name = "朱老师";
  18.         let str = "hello" + name;
  19.         let str = `Hello ${name}`; //这行代码等价于上面的代码
  20.         // 字面量：Hello
  21.         // 插值：${name}
  22.         console.log(str);
  23.         // 1.模板字面量：将表达式/插值嵌入到字符串中
  24.         //模板字面量内部有2部分组成：字符串字面量，变量插值
  25.         let menus = ['首页', '视频', '文章'];
  26.         let htmlStr = `
  27.                     <nav>
  28.         <a herf="">${menus[0]}
  29.         <a herf="">${menus[1]}
  30.         <a herf="">${menus[2]}
  31.                         </nav>      
  32.                     `;
  33.         console.log(htmlStr);
  34.         // 2.标签函数，（模板函数）,自定义模板字面量的一些行为
  35.         const hello = (name) => (alert(name));
  36.         hello("谢谢哦哦");
  37.         //参数约定：
  38.         // 1.第一个参数：所有字符串字面量组成的数组
  39.         // 2.第二个参数：变量插值组成的数组
  40.         let sum = (strs, a, b) => {
  41.             console.log(strs);
  42.             console.log(a, b);
  43.         }
  44.         let a = 5, b = 6;
  45.         sum`${a}+${b}=`;
  46.         // // rest: 归并参数
  47.         sum = (strs, ...args) => {
  48.             console.log(strs);
  49.             console.log(args);
  50.         }
  51.         let c = 7;
  52.         sum`${a}+${b}+${c}=`;
  53. 数组，对象，解构
  54.    //解构赋值
  55.         // 数组解构
  56.         // 等号左边是右边的模板，必须长得一样
  57.         let [a, b, c] = [1, 2, 3];//完全结构
  58.         [a, b] = [1, 2, 3];//不完全结构
  59.         [a, b, ...c] = [1, 2, 3, 4, 5, 6, 7, 8, 9];//把后面所有的参数给到C里面
  60.         //对象解构
  61.         let shangpin = { id: 1, sname: "手机" };
  62.         let id, sname;
  63.         // ({ id, sname } = { id: 1, sname: "手机" });
  64.         ({ id, sname } = shangpin);
  65.         console.log(id, sname);
  66.         //参数解构
  67.         //数组传参
  68.         let qiuhe = ([a, b]) => a + b;
  69.         // 上面的a,b相对于等号左边的模板,下面的30,50相当于等号右边的插值
  70.         console.log(qiuhe([30, 50]));
  71. 访问器属性的get,set操作
  72. <!DOCTYPE html>
  73. <html lang="en">
  74. <head>
  75.     <meta charset="UTF-8">
  76.     <meta http-equiv="X-UA-Compatible" content="IE=edge">
  77.     <meta name="viewport" content="width=device-width, initial-scale=1.0">
  78.     <title>访问器属性的get,set操作</title>
  79. </head>
  80. <body>
  81.     <!-- bingd(),call(),apply() -->
  82.     <!-- this:执行上下文,程序的运行环境 -->
  83.     <script>
  84.         let fwqsx = {
  85.             data: { name },
  86.             get name() {
  87.                 return this.data.name;
  88.             },
  89.             set name(v) {
  90.                 this.data.name = v;
  91.             }
  92.         };
  93.         fwqsx.name = "老师";
  94.         console.log(fwqsx.name);
  95.         // 访问器属于的优先级高于同名的普通属性
  96.         fwqsx.data.name = "老师1";
  97.         console.log(fwqsx.data.name);
  98.     </script>
  99. </body>
  100. </html>
Correcting teacher：PHPzPHPz

Correction status：qualified

Teacher's comments：
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