HTML DOM console.time()用法及代码示例

HTML中的console.time()方法用于在控制台视图中启动计时器。 console.time()方法可用于计算各种测试目的的程序时间。标签将作为参数发送到console.time()方法。

用法:

console.time( label )

参数：此方法接受单个参数标签，该标签是可选的，用于指定计时器的标签。

以下程序说明了HTML中的console.time()方法：

范例1：

<!DOCTYPE html> 
<html> 
  
<head> 
    <title>DOM console.time() Method in HTML</title> 
    <style> 
        h1 { 
            color:green; 
        } 
          
        h2 { 
            font-family:Impact; 
        } 
          
        body { 
            text-align:center; 
        } 
    </style> 
</head> 
  
<body> 
    <h1>GeeksforGeeks</h1> 
    <h2>DOM console.time() Method</h2> 
    <p> 
      To view the message in the console 
      press the F12 key on your keyboard. 
    </p> 
    <p> 
      To view the time taken by a for loop 
      to run 100 times, double click the  
      button below:
    </p> 
    <br> 
    <button ondblclick="table_time()"> 
      RUN TIMER 
    </button> 
    <script> 
        function table_time() { 
            console.time(); 
            for (i = 0; i < 100; i++) { 
                // Random code 
            } 
            console.timeEnd(); 
        } 
    </script> 
</body> 
  
</html>

输出：

控制台视图：

范例2：使用console.time()方法计算while循环所花费的时间

<!DOCTYPE html> 
<html> 
  
<head> 
    <title>DOM console.time() Method in HTML</title> 
    <style> 
        h1 { 
            color:green; 
        } 
          
        h2 { 
            font-family:Impact; 
        } 
          
        body { 
            text-align:center; 
        } 
    </style> 
</head> 
  
<body> 
    <h1>GeeksforGeeks</h1> 
    <h2>DOM console.time() Method</h2> 
    <p> 
      To view the message in the console 
      press the F12 key on your keyboard. 
    </p> 
    <p> 
      To view the time taken by a for loop 
      to run 100 times, double click the 
      button below:
    </p> 
    <br> 
    <button ondblclick="table_time()"> 
      RUN TIMER 
    </button> 
    <script> 
        function table_time() { 
            i = 0; 
            console.time 
                ("While loop for 100 iterations"); 
            while (i < 100) { 
                i++; 
            } 
            console.timeEnd 
                ("While loop for 100 iterations"); 
        } 
    </script> 
</body> 
  
</html>

输出：

控制台视图：

支持的浏览器：console.time()方法支持的浏览器如下：

谷歌浏览器
Internet Explorer 11.0
Firefox 10.0
Opera
Safari 4.0

相关用法

注：本文由纯净天空筛选整理自Shubrodeep Banerjee大神的英文原创作品 HTML | DOM console.time() Method。非经特殊声明，原始代码版权归原作者所有，本译文未经允许或授权，请勿转载或复制。