lovecoding
/
web0715


			
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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>
    var obj = {
        name:"张三",
        age:"",
        sayName:function(){
            console.log(this.name)
        }
    }
    // delete console.log
    delete obj.age;
    console.log(obj);


    // var arr = new Array(1,2,3);
    // console.log(arr);
    // var str = "hello";
    // delete str;
    // console.log(str)
    // var arr = new Array(5);
    var arr = new Array;
    console.log(arr);


    // var str2 = new String("hello world");
    // console.log(str2 + "你好")


    // console.log(obj.name);

    // var arr = [1,2,3,4];
    // console.log(arr.length);

    // var todyObj = new Date();

    // var obj2 = new Object({a:'1',b:'hello'});
    // console.log(obj2.b);

    // var rightNow = new Date();
    // console.log(rightNow.getDay());
    // console.log(rightNow.getDate());

    // var str10 = "hello world";
    // console.log(str10[1]);
    // console.log(str10.charAt(1));
    // var s = "1234567890";
    // s = s.substr(5,2);
    // console.log(s);

   </script>
</body>
</html>