Here, we are designing a function named change() that has an argument and we are trying to change the value of the passed argument inside the function, but it will not effect to the main/actual argument that is passed as the argument while calling.
在这里，我们正在设计一个名为change()的函数，该函数具有一个参数，并且试图更改该函数内部传递的参数的值，但不会影响在调用时作为参数传递的main / actual参数。
Example:
例：
a =10
Value before function call: a = 10
//calling function
change(a)
//changing inside the function
a = 67
Value inside the function: a = 67
//printing the value after the function call
Value after the function call: a =10
Code:
码：
<html lang="en">
<head>
<script>
function change(a){
a=67;
document.write("Inside Function: A = "+a+"<Br />");
}
</script>
</head>
<body>
<script>
var a=10;
document.write("Before Calling : A = "+a+"<br />");
change(a);
document.write("After Calling : A = "+a+"<br />");
</script>
</body>
</html>
Output
输出量
Before Calling : A = 10
Inside Function: A = 67
After Calling : A = 10
翻译自: https://www.includehelp.com/code-snippets/call-by-value-in-function-javascript.aspx
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