基本的Javascript字符串操作

Question

Hello there everyone,

I've been trying to figure out how to create a function that takes any input and adds spaces to it before returning it. For example. The function would change "hello" into "hello" When I perform the task -not- as a function, it seems to work okay. I previously had some good feedback about using the split() and join() functions and that seems to get the desired effect.

It just doesn't seem to be working as a function. Here is the code that I have come up with so far:

function sStr(aString)
{   
    var mySplitResult = aString.split("").join(" ");
    return mySplitResult;  
}
window.alert(sStr(test));

I would really appreciate any help with this as I'm racking my brains trying to learn this stuff. I can see that I still have a long way to go.

Answer 1

在test周围加上引号，例如：

alert(sStr("test"));

Answer 2

In your code, test is not a string, but a variable. Strings need to be inserted in quotes or double quotes.

function sStr(aString)
{   
    return aString.split("").join(" ");
}
window.alert(sStr('test'));

Check this fiddle .

Answer 3

It works, just add quotes around test :

function sStr(aString)
{   
    var mySplitResult = aString.split("").join(" ");
    return mySplitResult;  
}
window.alert(sStr("test"));

Answer 4

It looks your function works beautifully. In this line:

window.alert(sStr(test));

Is test a variable, or did you mean to provide a string:

window.alert(sStr('test'));

While we're at it, you may want to make your function handle the cases where the (1) parameter is undefined or null and (2) the parameter is not a string (eg: numbers):

function sStr(aString)
{   
    if(!aString)
    {
        return "";
    }

    var mySplitResult = aString.toString().split("").join(" ");
    return mySplitResult;  
}