lovecoding
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VIP32


			
				
					
						
						
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							<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
  </head>
  <body>
    <script>
      function fn1(x, y) {
        var sum = x + y;
        console.log(sum, "sum");
        console.log(this, "this");
        console.log(this.name, "name");
      }
      var obj = {
        name: "Lucy",
      };
      fn1(2, 3);
      fn1.call(obj, 2, 3);
//单行注释
      /**
       * 多行注释
       */
      /** 修改this指向
       * 1.call(修改this指向,参数1，参数2...)
       * 2.apply(修改this指向,[参数1,参数2,...])
       * 3.bind(修改this指向,参数1,参数2)()
       */
      /**
       * call、apply和bind区别
       * 1.bind无法进行函数调用，call和apply可以直接进行函数调用;
       * 2.call从第二项开始，要传的参数逐个传入;
       * 3.apply从第二项开始，要传的参数在数组中逐个传入
      */
      function fn2(a, b) {
        var sum = a * b;
        console.log(sum, "sum1");
        console.log(this, "this1");
        console.log(this.sex, "sex");
      }
      var obj1 = {
        sex: "女",
        address: "11111",
      };
      fn2(4, 5);
      fn2.apply(obj1, [4, 5]);

      function fn3(i,j) {
        var sum = i - j;
        console.log(sum,'sum');
        console.log(this,'this');
        console.log(this.age,'age');
      }
      var obj2 = {
        age: 18,
        day: '星期四'
      }
      fn3(79,8);
      fn3.bind(obj2,79,8)();
    </script>
  </body>
</html>