console.time()HTML中的方法用于在控制台视图中启动计时器。的console.time()该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.
语法如下：
console.time( label )参数：此方法接受单个参数标签这是可选的, 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>srcmini</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>输出如下：
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>srcmini</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>输出如下：
控制台视图：
支持的浏览器：支持的浏览器console.time()方法下面列出：
- 谷歌浏览器
- Internet Explorer 11.0
- Firefox 10.0
- 歌剧
- Safari 4.0
