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基于 Playwright(python) 的前端性能测试脚本实现

  • 2026-02-05 05:20:13
基于 Playwright(python) 的前端性能测试脚本实现
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引言

在当今Web应用开发中,性能优化是提升用户体验的关键因素之一。本文将介绍如何使用Playwright构建一个自动化性能测试工具,帮助开发者全面分析网页性能瓶颈并获取优化建议。

工具概述

这个脚本主要功能包括:

  1. 自动收集页面加载性能指标;

  2. 分析资源加载情况;

  3. 生成详细的性能报告;

  4. 提供优化建议。

整体架构

核心实现解析

1. 浏览器初始化

def _initialize_browser(self):    """初始化浏览器环境"""    self.playwright = sync_playwright().start()  # 启动Playwright    self.browser = self.playwright.chromium.launch(headless=False)  # 启动Chromium浏览器    self.context = self.browser.new_context(        ignore_https_errors=True,  # 忽略HTTPS错误        bypass_csp=True,  # 绕过内容安全策略        extra_http_headers={  # 设置HTTP头禁用缓存            'Cache-Control''no-store, no-cache, must-revalidate',            'Pragma''no-cache'        }    )    self.page = self.context.new_page()  # 创建新页面    self.page.goto('about:blank')  # 导航到空白页    self.page.route('**'lambda route: route.continue_())  # 拦截所有请求并继续

关键配置说明:

  • ignore_https_errors=True:忽略证书错误,便于测试开发环境;

  • bypass_csp=True:绕过内容安全策略限制;

  • 禁用缓存:确保每次测试都从服务器获取最新资源。

2. 性能数据收集

def _collect_performance_metrics(self) -> Dict[strAny]:    """收集性能指标数据"""    start_time = time.time()  # 记录开始时间    self.page.goto(self.test_url, wait_until="networkidle")  # 导航到目标URL    end_time = time.time()  # 记录结束时间    # 基础指标:页面加载总时间    self.metrics_data = {        'load_time_seconds': end_time - start_time,    }    # 通过浏览器API获取详细性能指标    browser_metrics = self.page.evaluate('''() => {        try {            const navEntries = performance.getEntriesByType("navigation");            const resources = performance.getEntriesByType("resource") || [];            return {                navigation: navEntries.length > 0 ? navEntries[0].toJSON() : {},                resources: resources.map(r => r.toJSON())            };        } catch (e) {            return { navigation: {}, resources: [] };        }    }''')

数据收集策略:

  1. 使用高精度时间戳记录页面加载总时间;

  2. 通过performance.getEntriesByTypeAPI获取Navigation Timing和Resource Timing数据;

  3. 捕获异常确保测试不会因单个页面错误而中断。

3.资源分析

def _analyze_resources(self, resources: List[Dict]) -> Dict[strAny]:    """分析资源加载情况"""    resource_types = defaultdict(list)  # 按类型分类资源    slow_resources = []  # 存储加载缓慢的资源    # 分类和分析资源    for res in resources:        res_type = res.get('initiatorType''other')        resource_types[res_type].append(res)        duration = res.get('duration')        if isinstance(duration, (intfloat)) and duration > 500:            slow_resources.append({                'name': res.get('name''unknown'),                'type': res_type,                'duration': duration            })    # 计算统计信息

分析维度:

  • 按资源类型(JS/CSS/图片等)分类统计

  • 识别加载时间超过500ms的慢资源

  • 计算各类资源的平均加载时间和总耗时

4. 关键性能指标计算

def _analyze_metrics(self):    """分析关键性能指标"""    nav_entry = self.metrics_data.get('navigation', {})    self.metrics_data['analysis'] = {        'dom_ready_time': nav_entry.get('domContentLoadedEventEnd'),  # DOM准备就绪时间        'full_load_time': nav_entry.get('loadEventEnd'),  # 完整加载时间        'first_byte': nav_entry.get('responseStart'0) - nav_entry.get('requestStart'0)        if all(k in nav_entry for k in ['responseStart''requestStart'])        else None,  # 首字节时间(TTFB)        'page_render_time': nav_entry.get('domComplete'0) - nav_entry.get('domLoading'0)        if all(k in nav_entry for k in ['domComplete''domLoading'])        else None,  # 页面渲染时间        'resource_count'self.resource_analysis.get('total_resources'0),  # 资源总数        'avg_resource_load_time'self.resource_analysis.get('avg_resource_load_time'0)    }

核心指标说明:

5. 智能优化建议生成

def _generate_recommendations(self) -> List[str]:    """根据分析结果生成优化建议"""    recommendations = []    analysis = self.metrics_data.get('analysis', {})    resources = self.resource_analysis    # 资源数量过多建议    if analysis.get('resource_count'0) > 50:        recommendations.append(            f"资源数量较多({analysis['resource_count']}个),建议合并CSS/JS文件,使用雪碧图减少图片资源"        )    # 慢资源优化建议    slow_resources = [        r for r in resources.get('top_slowest', [])        if r.get('duration'0) > 1000    ]

建议生成逻辑基于以下规则:

  1. 资源数量 > 50 → 建议合并资源;

  2. 平均资源加载时间 > 300ms → 检查CDN或服务器;

  3. 存在加载时间 > 1s的资源 → 提示优化具体资源。

使用示例
if __name__ == "__main__":    # 创建测试实例并运行测试    tester = PerformanceTester(url="https://example.com")    tester.run_test()

输出示例:

开始测试页面: https://example.com=== 核心性能指标 ===1. 页面加载时间: 2.34秒2. DOMContentLoaded: 1245.23ms3. 完全加载时间: 2340.56ms4. 首字节时间(TTFB): 345.67ms5. 页面渲染时间: 895.32ms6. 资源数量: 427. 平均资源加载时间: 215.43ms=== 资源加载分析 ===总资源数量: 42平均资源加载时间: 215.43ms按类型统计:  SCRIPT: 12个, 平均加载时间: 185.32ms  IMAGE: 20个, 平均加载时间: 245.67ms  CSS: 5个, 平均加载时间: 156.89ms=== 优化建议 ===1. 资源数量较多(42个),建议合并CSS/JS文件,使用雪碧图减少图片资源2. 发现加载缓慢的资源(2个),建议优化: example.com/big-image.jpg(1245ms), example.com/main.js(1123ms)
END

链接:https://juejin.cn/post/7533861390500511796

本文为51Testing经授权转载,转载文章所包含的文字来源于作者。如因内容或版权等问题,请联系51Testing进行删除

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  1. 请求信息 : 2026-02-08 16:37:24 HTTP/2.0 GET : https://f.mffb.com.cn/a/463396.html
  2. 运行时间 : 0.203591s [ 吞吐率:4.91req/s ] 内存消耗:4,675.77kb 文件加载:140
  3. 缓存信息 : 0 reads,0 writes
  4. 会话信息 : SESSION_ID=cd4c4e2b5eb49ee6385c25ccf19a5b83
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  1. CONNECT:[ UseTime:0.000552s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000872s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000411s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000270s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000504s ]
  6. SELECT * FROM `set` [ RunTime:0.004494s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000745s ]
  8. SELECT * FROM `article` WHERE `id` = 463396 LIMIT 1 [ RunTime:0.010454s ]
  9. UPDATE `article` SET `lasttime` = 1770539844 WHERE `id` = 463396 [ RunTime:0.002194s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.005081s ]
  11. SELECT * FROM `article` WHERE `id` < 463396 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.004607s ]
  12. SELECT * FROM `article` WHERE `id` > 463396 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001917s ]
  13. SELECT * FROM `article` WHERE `id` < 463396 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.032204s ]
  14. SELECT * FROM `article` WHERE `id` < 463396 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.041191s ]
  15. SELECT * FROM `article` WHERE `id` < 463396 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.032781s ]
0.205121s