| | |
| | | const shape = { |
| | | radius: 9, |
| | | d() { |
| | | return this.radius * 2; |
| | | }, |
| | | p: () => 2 * Math.PI * this.radius, |
| | | }; |
| | | // const shape = { |
| | | // radius: 9, |
| | | // d() { |
| | | // return this.radius * 2; |
| | | // }, |
| | | // p: () => 2 * Math.PI * this.radius, |
| | | // }; |
| | | |
| | | console.log(shape.d()); |
| | | console.log(shape.p()); |
| | | // console.log(shape.d()); |
| | | // console.log(shape.p()); |
| | | |
| | | const str = 'abc'; |
| | | if (str[0] >= 'a' && str[0] <= 'z') { |
| | | let a = parseInt(str[0]); |
| | | a -= 32; |
| | | console.log(a); |
| | | } |
| | | // const str = 'abc'; |
| | | // if (str[0] >= 'a' && str[0] <= 'z') { |
| | | // let a = parseInt(str[0]); |
| | | // a -= 32; |
| | | // console.log(a); |
| | | // } |
| | | |
| | | |
| | | let a = 4 |
| | | let b = new Number(4) |
| | | let c = '4' |
| | | console.log(a == b); |
| | | console.log(a === b); |
| | | console.log(a == c); |
| | | console.log(b === c); |