<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>reactive方法和watchEffect方法</title>
<script src="https://unpkg.com/vue@next"></script>
</head>
<body>
<div id="app">
<post-item :post-content="content"></post-item>
</div>
<script>
//创建组件;
const { reactive, watchEffect } = Vue;
//创建常量;
const state = reactive({ count: 0 });
//函数方法;
watchEffect(() => {
document.body.innerHTML = `商品库存为：${state.count}`
});
</script>
</body>
</html>
ref方法的使用
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>ref方法</title>
<script src="https://unpkg.com/vue@next"></script>
</head>
<body>
<div id="app">
<post-item :post-content="content"></post-item>
</div>
<script>
const { ref, watchEffect } = Vue;
//创建函数
const state = ref(0)
watchEffect(() => {
document.body.innerHTML = `商品库存为:${state.value}台`
});
</script>
</body>
</html>
computed方法的使用
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>computed方法</title>
<script src="https://unpkg.com/vue@next"></script>
</head>
<body>
<div id="app">
<p>原始字符串：{{msg}}</p>
<p>反转后的字符串:{{revmsg}}</p>
</div>3VrzcxJNG YYYYFUO[[PONPOPIWDAEWZSW55z[,[,
]]]]
<script>
const { ref, computed } = Vue;
const vm = Vue.createApp({
setup() {
const msg = ref('人世几回伤往事');
const revmsg = computed(() =>
msg.value.split('').reverse().join(''));
return {
msg,
revmsg
}
}
});
vm.mount('#app');
</script>
</body>
</html>
