测试用例分为用函数和类来进行一个大字符串的字符逐一读取。

测试代码

Node.js

函数

var fs = require("fs"); var content = fs.readFileSync("page.html", { encoding: "utf-8" }); function chars(content){ var length = content.length; var pos = 0; while(pos ++ < length){ var chr = content[pos - 1]; } } var start = Date.now(); chars(content); var end = Date.now(); console.log(end - start);

类

var fs = require("fs"); var content = fs.readFileSync("page.html", { encoding: "utf-8" }); var Chars = function(str){ this.str = str; this.length = str.length this.pos = 0; } Chars.prototype.run = function(){ while(this.pos ++ < this.length){ var chr = this.str[this.pos - 1]; } } var start = Date.now(); var instance = new Chars(content); instance.run(); var end = Date.now(); console.log(end - start);

PHP

函数

<?php function chars($content){ $length = strlen($content); $pos = 0; while ($pos ++ < $length) { $char = $content{$pos - 1}; } } $content = file_get_contents("page.html"); $start = microtime(true); chars($content); $end = microtime(true); echo ($end - $start) . "n"; ?>

类

<?php class Chars{ public function __construct($str){ $this->str = $str; $this->length = strlen($str); $this->pos = 0; } public function run(){ while($this->pos++ < $this->length){ $char = $this->str{$this->pos - 1}; } } } $content = file_get_contents("page.html"); $start = microtime(true); $instance = new Chars($content); $instance->run(); $end = microtime(true); echo ($end - $start) . "n"; ?>

Python

函数

import codecs import time def chars(content): length = len(content) pos = 0 while(pos < length): char = content[pos] pos = pos + 1 f = codecs.open('page.html', encoding='utf-8') content = f.read() start = time.time() chars(content) end = time.time(); print end - start

类

import codecs import time class Chars(): def __init__(self, str): self.str = str self.length = len(str) self.pos = 0 def run(self): while(self.pos < self.length): char = self.str[self.pos] self.pos = self.pos + 1 f = codecs.open('page.html', encoding='utf-8') content = f.read() start = time.time() instance = Chars(content) instance.run() end = time.time(); print (end - start)

其中 page.html 文件内容为一个长度为 的文本。

测试结果

语言 函数 类 Node.js 0.022s 0.026s PHP 0.35s 1.02s Python 0.58s 1.50s