Svelte 语句
我们不仅提供了声明反应式的 值，我们还可以运行反应式的 语句。例如，当 count 的值改变时就输出到日志中：$: console.log(the count is ${count});你可以轻松地将一组语句组合成一个代码块：$: {
console.log(the count is ${count});
alert(I SAID THE COUNT IS ${count});
}你甚至可以将 $: 放在= if 代码块前面：$: if (count >= 10) {
alert(count is dangerously high!);
count = 9;
}