How to use the arguments object in JavaScript function
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Arguments object in JavaScript function
The JavaScript function has a built-in object called the arguments object.
The arguments object contains an array of parameters used when the function is called.
In this way, you can simply use functions to find, for example, the highest value in a list of numbers:
Example
X = findMax (1,123,500,115,44,88)
Function findMax () {
Var i
Var max =-Infinity
For (I = 0; I)
< arguments.length; i++） { if （arguments[i] >Max) {
Max = arguments [I]
}
}
Return max
}
Or create a function to sum up all input values:
Example
X = sumAll (1,123,500,115,44,88)
Function sumAll () {
Var I, sum = 0
For (I = 0; I < arguments.length; iTunes +) {
Sum + = arguments [I]
}
Return sum
}
Parameters are passed by value
The parameter (parameter) in the function call is the parameter (argument) of the function.
The JavaScript parameter is passed by value: the function only knows the value, not the position of the parameter.
If the function changes the value of the parameter, it does not change the original value of the parameter.
Changes in parameters are not visible outside the function.
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