ES6 集合 Set 方法 delete()

var set = new Set();
set.add(10);
set.add(20);
set.add(30);
console.log(`Size of Set before delete() :${set.size}`);
console.log(`Set has 10 before delete() :${set.has(10)}`);

set.delete(10)
console.log(`Size of Set after delete() :${set.size}`);
console.log(`Set has 10 after delete() :${set.has(10)}`)