Log in JavaScript means "logarithm" and is a method of the Math object. The syntax is "Math.log(x)"; the log() method can return the natural logarithm of the number "x". If the parameter value is a negative number, the return result is "NaN". If the parameter value is 0, the return result is "-Infinity".
The operating environment of this tutorial: Windows 10 system, JavaScript version 1.8.5, Dell G3 computer.
What is the meaning of log in JavaScript
log in JavaScript means "logarithm", the log() method returns the natural value of a number Logarithm (base E).
The syntax of this method is as follows:
Math.log(x)
If the parameter x is a negative number, NaN will be returned. If parameter x is 0, then -Infinity is returned. The result returned is the natural logarithm of x.
The example is as follows:
<html>
<head>
<meta charset="utf-8">
<title>123</title>
</head>
<body>
<p id="demo">单击按钮显示不同数值的自然对数。</p>
<button onclick="myFunction()">点我</button>
<script>
function myFunction(){
var a=Math.log(2.7183);
var b=Math.log(2);
var c=Math.log(1);
var d=Math.log(0);
var e=Math.log(-1);
var x=document.getElementById("demo");
x.innerHTML=a + "<br>" + b + "<br>" + c + "<br>" + d + "<br>" + e
}
</script>
</body>
</html>Output result:
javascript learning tutorial 】
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