feat: save current work to dev branch

This commit is contained in:
sanbuphy
2026-01-15 20:10:19 +08:00
parent c9e7ece75d
commit c8567ce23f
76 changed files with 28352 additions and 6 deletions
@@ -0,0 +1,387 @@
<template>
<div class="tcp-handshake-demo">
<div class="participants">
<div class="participant client">
<div class="participant-icon">💻</div>
<div class="participant-name">客户端</div>
<div class="participant-ip">192.168.1.100</div>
</div>
<div class="connection-area">
<div class="connection-line" :class="{ active: step >= 1 }"></div>
<div class="packets">
<div
v-for="(packet, index) in packets"
:key="index"
class="packet"
:class="{
active: step === index + 1,
sent: step > index + 1
}"
>
<div class="packet-content">{{ packet.content }}</div>
<div class="packet-direction">{{ packet.direction }}</div>
</div>
</div>
</div>
<div class="participant server">
<div class="participant-icon">🖥</div>
<div class="participant-name">服务器</div>
<div class="participant-ip">93.184.216.34</div>
</div>
</div>
<div class="controls">
<button
class="control-btn"
@click="startHandshake"
:disabled="handshaking || step === 3"
>
{{ step === 3 ? '✅ 握手完成' : handshaking ? '🔄 握手中...' : '🤝 开始三次握手' }}
</button>
<button class="control-btn reset" @click="reset" v-if="step === 3">
🔄 重新演示
</button>
</div>
<div class="step-explanation">
<div class="explanation-title">当前步骤说明</div>
<div class="explanation-content" v-if="step === 0">
点击"开始三次握手"按钮观察客户端和服务器如何建立可靠连接
</div>
<div class="explanation-content" v-else-if="step === 1">
<strong>第一步SYN同步请求</strong>
<br><br>
客户端发送一个 SYN 包给服务器告诉服务器"我想和你建立连接"
<br>
客户端会生成一个随机序列号seq=x这个号码很重要后续的数据传输都要用它来保证数据不丢失不重复
</div>
<div class="explanation-content" v-else-if="step === 2">
<strong>第二步SYN-ACK同步确认</strong>
<br><br>
服务器收到客户端的 SYN 请求后
<br>1. 生成自己的随机序列号seq=y
<br>2. 把客户端的序列号加 1ack=x+1表示"我收到了你的请求"
<br>3. 发送 SYN-ACK 包给客户端
</div>
<div class="explanation-content" v-else-if="step === 3">
<strong>第三步ACK确认</strong>
<br><br>
客户端收到服务器的 SYN-ACK
<br>1. 把服务器的序列号加 1ack=y+1表示"我也收到了你的确认"
<br>2. 发送 ACK 包给服务器
<br><br>
<strong>🎉 连接建立成功</strong>双方现在可以开始传输数据了
</div>
</div>
<div class="why-three">
<div class="why-title">🤔 为什么需要三次握手</div>
<div class="why-content">
<div class="why-item">
<strong>1. 确认双方都能正常收发数据</strong>
<br>
第一次握手证明客户端能发送
<br>
第二次握手证明服务器能接收和发送
<br>
第三次握手证明客户端能接收
</div>
<div class="why-item">
<strong>2. 防止已失效的连接请求突然传到服务器</strong>
<br>
如果只有两次握手客户端发送的第一个连接请求在网络中滞留
等到连接释放后才到达服务器服务器会误以为是新的连接请求
浪费资源三次握手可以避免这个问题
</div>
<div class="why-item">
<strong>3. 同步双方的初始序列号</strong>
<br>
双方需要协商一个起始序列号用于后续的数据传输和确认
</div>
</div>
</div>
<div class="analogy">
<div class="analogy-title">💡 生活中的类比</div>
<div class="analogy-content">
想象你在打电话给朋友
<br><br>
<strong></strong>"喂?你能听到我说话吗?" SYN
<br>
<strong>朋友</strong>"能听到,你能听到我吗?" SYN-ACK
<br>
<strong></strong>"我也能听到!" ACK
<br><br>
现在双方确认都能听到对方可以开始正常通话了
</div>
</div>
</div>
</template>
<script setup>
import { ref } from 'vue'
const step = ref(0)
const handshaking = ref(false)
const packets = [
{
content: 'SYN seq=x',
direction: '客户端 → 服务器'
},
{
content: 'SYN-ACK seq=y, ack=x+1',
direction: '服务器 → 客户端'
},
{
content: 'ACK ack=y+1',
direction: '客户端 → 服务器'
}
]
const startHandshake = () => {
if (handshaking.value || step.value === 3) return
handshaking.value = true
step.value = 0
setTimeout(() => {
step.value = 1
setTimeout(() => {
step.value = 2
setTimeout(() => {
step.value = 3
handshaking.value = false
}, 1500)
}, 1500)
}, 500)
}
const reset = () => {
step.value = 0
handshaking.value = false
}
</script>
<style scoped>
.tcp-handshake-demo {
border: 1px solid var(--vp-c-divider);
border-radius: 8px;
padding: 20px;
background: var(--vp-c-bg-soft);
margin: 20px 0;
}
.participants {
display: flex;
justify-content: space-between;
align-items: center;
margin-bottom: 30px;
gap: 20px;
}
.participant {
flex: 1;
text-align: center;
padding: 20px;
background: var(--vp-c-bg);
border-radius: 8px;
border: 2px solid var(--vp-c-divider);
}
.participant.client {
border-color: #3b82f6;
}
.participant.server {
border-color: #ef4444;
}
.participant-icon {
font-size: 3rem;
margin-bottom: 10px;
}
.participant-name {
font-size: 1rem;
font-weight: bold;
color: var(--vp-c-text-1);
margin-bottom: 5px;
}
.participant-ip {
font-size: 0.8rem;
color: var(--vp-c-text-3);
font-family: monospace;
}
.connection-area {
flex: 1;
position: relative;
padding: 20px;
}
.connection-line {
position: absolute;
top: 50%;
left: 0;
right: 0;
height: 2px;
background: var(--vp-c-divider);
transition: all 0.3s;
}
.connection-line.active {
background: linear-gradient(90deg, #3b82f6, #ef4444);
}
.packets {
display: flex;
flex-direction: column;
gap: 15px;
position: relative;
z-index: 1;
}
.packet {
padding: 12px;
background: var(--vp-c-bg);
border: 2px solid var(--vp-c-divider);
border-radius: 6px;
opacity: 0.3;
transform: scale(0.9);
transition: all 0.3s;
}
.packet.active {
opacity: 1;
transform: scale(1.05);
border-color: var(--vp-c-brand);
box-shadow: 0 4px 12px rgba(59, 130, 246, 0.3);
}
.packet.sent {
opacity: 0.6;
}
.packet-content {
font-size: 0.85rem;
color: var(--vp-c-brand);
font-family: monospace;
font-weight: 600;
margin-bottom: 4px;
}
.packet-direction {
font-size: 0.75rem;
color: var(--vp-c-text-3);
}
.controls {
display: flex;
gap: 10px;
margin-bottom: 25px;
justify-content: center;
}
.control-btn {
padding: 12px 24px;
background: var(--vp-c-brand);
color: white;
border: none;
border-radius: 6px;
font-size: 0.9rem;
font-weight: 600;
cursor: pointer;
transition: all 0.2s;
}
.control-btn:hover:not(:disabled) {
background: var(--vp-c-brand-dark);
}
.control-btn:disabled {
opacity: 0.6;
cursor: not-allowed;
}
.control-btn.reset {
background: #22c55e;
}
.control-btn.reset:hover {
background: #16a34a;
}
.step-explanation {
background: var(--vp-c-bg);
border-radius: 8px;
padding: 20px;
margin-bottom: 25px;
border-left: 4px solid var(--vp-c-brand);
}
.explanation-title {
font-size: 1rem;
font-weight: bold;
color: var(--vp-c-text-1);
margin-bottom: 12px;
}
.explanation-content {
font-size: 0.9rem;
color: var(--vp-c-text-2);
line-height: 1.8;
}
.why-three {
background: var(--vp-c-bg);
border-radius: 8px;
padding: 20px;
margin-bottom: 25px;
}
.why-title {
font-size: 1rem;
font-weight: bold;
color: var(--vp-c-text-1);
margin-bottom: 15px;
}
.why-content {
display: flex;
flex-direction: column;
gap: 15px;
}
.why-item {
font-size: 0.85rem;
color: var(--vp-c-text-2);
line-height: 1.8;
padding: 12px;
background: var(--vp-c-bg-soft);
border-radius: 6px;
}
.analogy {
background: var(--vp-c-bg);
border-radius: 8px;
padding: 20px;
border-left: 4px solid #f59e0b;
}
.analogy-title {
font-size: 1rem;
font-weight: bold;
color: var(--vp-c-text-1);
margin-bottom: 12px;
}
.analogy-content {
font-size: 0.9rem;
color: var(--vp-c-text-2);
line-height: 1.8;
}
</style>