108 lines
4.9 KiB
Vue
108 lines
4.9 KiB
Vue
|
<template>
|
|||
|
|
<div class="strong-vs-weak-demo">
|
|||
|
|
<h4>⚡ 强类型 vs 弱类型：隐式转换实验室</h4>
|
|||
|
|
<p class="desc">输入一个表达式，看看不同语言怎么处理</p>
|
|||
|
|
|
|||
|
|
<div class="expr-selector">
|
|||
|
|
<button
|
|||
|
|
v-for="(ex, i) in expressions"
|
|||
|
|
:key="i"
|
|||
|
|
:class="['expr-btn', { active: selected === i }]"
|
|||
|
|
@click="selected = i"
|
|||
|
|
>
|
|||
|
|
<code>{{ ex.expr }}</code>
|
|||
|
|
</button>
|
|||
|
|
</div>
|
|||
|
|
|
|||
|
|
<div class="results-grid">
|
|||
|
|
<div v-for="lang in expressions[selected].langs" :key="lang.name" class="lang-card">
|
|||
|
|
<div class="lang-header">
|
|||
|
|
<span class="lang-name">{{ lang.name }}</span>
|
|||
|
|
<span :class="['lang-type', lang.strong ? 'strong' : 'weak']">
|
|||
|
|
{{ lang.strong ? '强类型' : '弱类型' }}
|
|||
|
|
</span>
|
|||
|
|
</div>
|
|||
|
|
<pre class="lang-code">{{ lang.code }}</pre>
|
|||
|
|
<div :class="['lang-result', lang.error ? 'error' : 'success']">
|
|||
|
|
{{ lang.result }}
|
|||
|
|
</div>
|
|||
|
|
</div>
|
|||
|
|
</div>
|
|||
|
|
|
|||
|
|
<div class="takeaway">
|
|||
|
|
📌 {{ expressions[selected].takeaway }}
|
|||
|
|
</div>
|
|||
|
|
</div>
|
|||
|
|
</template>
|
|||
|
|
|
|||
|
|
<script setup>
|
|||
|
|
import { ref } from 'vue'
|
|||
|
|
|
|||
|
|
const selected = ref(0)
|
|||
|
|
|
|||
|
|
const expressions = [
|
|||
|
|
{
|
|||
|
|
expr: '"1" + 1',
|
|||
|
|
langs: [
|
|||
|
|
{ name: 'JavaScript', strong: false, code: '"1" + 1', result: '→ "11"（字符串拼接）', error: false },
|
|||
|
|
{ name: 'Python', strong: true, code: '"1" + 1', result: '→ TypeError: can only concatenate str to str', error: true },
|
|||
|
|
{ name: 'Java', strong: false, code: '"1" + 1', result: '→ "11"（字符串拼接）', error: false },
|
|||
|
|
{ name: 'Rust', strong: true, code: '"1" + 1', result: '→ 编译错误：类型不匹配', error: true }
|
|||
|
|
],
|
|||
|
|
takeaway: '强类型语言拒绝猜测你的意图，宁可报错也不悄悄转换。弱类型语言会"好心"帮你转，但结果可能不是你想要的。'
|
|||
|
|
},
|
|||
|
|
{
|
|||
|
|
expr: 'true + 1',
|
|||
|
|
langs: [
|
|||
|
|
{ name: 'JavaScript', strong: false, code: 'true + 1', result: '→ 2（true 被转为 1）', error: false },
|
|||
|
|
{ name: 'Python', strong: true, code: 'True + 1', result: '→ 2（Python 中 bool 是 int 子类）', error: false },
|
|||
|
|
{ name: 'Java', strong: false, code: 'true + 1', result: '→ 编译错误', error: true },
|
|||
|
|
{ name: 'C', strong: false, code: '1 + 1 // true=1', result: '→ 2（C 中没有 bool，用 0/1）', error: false }
|
|||
|
|
],
|
|||
|
|
takeaway: 'bool 和数字的关系因语言而异。Python 虽是强类型，但 bool 继承自 int，这是设计选择而非弱类型。'
|
|||
|
|
},
|
|||
|
|
{
|
|||
|
|
expr: '"5" == 5',
|
|||
|
|
langs: [
|
|||
|
|
{ name: 'JavaScript', strong: false, code: '"5" == 5', result: '→ true（隐式转换后比较）', error: false },
|
|||
|
|
{ name: 'Python', strong: true, code: '"5" == 5', result: '→ False（类型不同，直接 False）', error: false },
|
|||
|
|
{ name: 'TypeScript', strong: false, code: '"5" == 5', result: '→ true（但 TSLint 会警告）', error: false },
|
|||
|
|
{ name: 'PHP', strong: false, code: '"5" == 5', result: '→ true（臭名昭著的松散比较）', error: false }
|
|||
|
|
],
|
|||
|
|
takeaway: 'JavaScript 的 == 会做隐式转换，这是无数 bug 的来源。所以社区推荐始终使用 === 严格比较。'
|
|||
|
|
}
|
|||
|
|
]
|
|||
|
|
</script>
|
|||
|
|
|
|||
|
|
<style scoped>
|
|||
|
|
.strong-vs-weak-demo {
|
|||
|
|
padding: 20px;
|
|||
|
|
border: 1px solid var(--vp-c-divider);
|
|||
|
|
border-radius: 12px;
|
|||
|
|
margin: 16px 0;
|
|||
|
|
background: var(--vp-c-bg-soft);
|
|||
|
|
}
|
|||
|
|
h4 { margin: 0 0 4px; }
|
|||
|
|
.desc { color: var(--vp-c-text-2); font-size: 14px; margin: 0 0 16px; }
|
|||
|
|
.expr-selector { display: flex; gap: 8px; margin-bottom: 16px; flex-wrap: wrap; }
|
|||
|
|
.expr-btn {
|
|||
|
|
padding: 6px 14px; border-radius: 6px; border: 1px solid var(--vp-c-divider);
|
|||
|
|
background: var(--vp-c-bg); cursor: pointer; font-size: 13px; transition: all 0.2s;
|
|||
|
|
}
|
|||
|
|
.expr-btn.active { background: var(--vp-c-brand-1); color: #fff; border-color: var(--vp-c-brand-1); }
|
|||
|
|
.expr-btn code { font-size: 13px; }
|
|||
|
|
.results-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 10px; }
|
|||
|
|
.lang-card { border: 1px solid var(--vp-c-divider); border-radius: 8px; background: var(--vp-c-bg); overflow: hidden; }
|
|||
|
|
.lang-header { display: flex; justify-content: space-between; align-items: center; padding: 6px 10px; background: var(--vp-c-bg-soft); border-bottom: 1px solid var(--vp-c-divider); }
|
|||
|
|
.lang-name { font-weight: 600; font-size: 13px; }
|
|||
|
|
.lang-type { font-size: 11px; padding: 2px 6px; border-radius: 4px; }
|
|||
|
|
.lang-type.strong { background: #dbeafe; color: #1e40af; }
|
|||
|
|
.lang-type.weak { background: #fef3c7; color: #92400e; }
|
|||
|
|
.lang-code { padding: 8px 10px; margin: 0; font-size: 12px; }
|
|||
|
|
.lang-result { padding: 6px 10px; font-size: 12px; border-top: 1px solid var(--vp-c-divider); }
|
|||
|
|
.lang-result.success { background: #f0fdf4; color: #166534; }
|
|||
|
|
.lang-result.error { background: #fef2f2; color: #991b1b; }
|
|||
|
|
.takeaway { margin-top: 12px; padding: 10px 14px; background: var(--vp-c-brand-soft); border-radius: 8px; font-size: 13px; }
|
|||
|
|
@media (max-width: 640px) { .results-grid { grid-template-columns: 1fr; } }
|
|||
|
|
</style>
|