es2016提案

es2016提案

 因为还是提案，jsconfig.json 需要设置 compilerOptions：{ experimentalDecorators: true}

// 上面是我写的
// 下面一位高人写的function factorial() {return (t, k, p) => {const fn = p.valuep.value = function (...args) {let vals = 0for (let i = 1; i <= args[1]; i++) {let numvals = 1for (let j = 1; j <= i; j++) {numvals *= j}vals += numvals}fn.call(this, vals, args[1])}}
}class First{@factorial()getFactorial(val, num) {let str = ''for (let i = 1; i <= num; i++) {if (i !== 1) str += ' + 'str += `${i}!`}console.log(`${str} = ` + val)}
}var first = new First()
Factorial(0, 9)