JS parameter passing example introduction_javascript skills

Normally, passing parameters is probably written like this:

Copy code The code is as follows:

var numParameter = 123;
function sendParameter()
{
getParameter(numParameter );
}
function getParameter(sendNum)
{
alert(sendNum);
}

A very simple method A calls method B and passes parameters.

However, if the parameters of method B are not fixed, different parameters may be required according to different situations. You can write like this:

Copy code The code is as follows:

var txtParameter1 = "123";
var txtParameter2 = "234";
var txtParameter3 = "345";
var txtSendParameter = "";
var flag = 0;
function sendParameter1()
{
flag = 1;
txtSendParameter = txtParameter1 ";" txtParameter2;
getParameter();
}
function sendParameter2()
{
flag = 2;
txtSendParameter = txtParameter2 ";" txtParameter3;
getParameter();
}
function getParameter( )
{
if(1==flag)
{
//goto functionC(txtSendParameter)
}
else if(2==flag)
{
//goto functionD(txtSendParameter)
}
else
{
return;
}
}

So can you do it without using global variables? Pass value:

Copy code The code is as follows:

var txtParameter1 = "123";
var txtParameter2 = "234";
var txtParameter3 = "345";
function sendParameter1()
{
var txtSendParameter = "1" txtParameter1 ";" txtParameter2;
getParameter(txtSendParameter ; )
{
switch(arguments[0])
{
case "1":
//goto functionC(arguments);
break;
case "2" :
//goto functionD(arguments);
break;
default:
//goto functionE(arguments);
}
}


Relatively speaking, arguments is a very flexible object. Although it is not an array, it can use subscripts to obtain values ​​​​like arrays. Although it is a bit unfamiliar, it is still very useful.




Copy code

The code is as follows:

<pre code_snippet_id="179244" snippet_file_name="blog_20140207_4_1482200">

< pre>

< ;/pre>