核心提示：ES6箭头函数和扩展代码实例讲解// 主动抛出异常function add(a,b = 1){if(a == 0){throw new Error(A is Error);}return a+b;}c...
ES6箭头函数和扩展代码实例讲解
// 主动抛出异常
function add(a,b = 1){
if(a == 0){
throw new Error('A is Error');
}
return a+b;
}
console.log(add(0));
function add(a,b = 1){
if(a == 0){
throw new Error('A is Error');
}
return a+b;
}
// 获取函数参数个数
console.log(add.length); // 返回1，返回必须传递的参数个数，此处是a
箭头函数
var add = (a,b = 1) => a + b;
document.write(add(1));
var add = (a,b = 2) => {
document.write('js')
return a + b;
}
document.write(add(2));
