javascript - replacing spaces with a string
I'm new to Javascript and need a bit of help with program on a college course to replace all the spaces in a string with the string "spaces".
I've used the following code but I just can't get it to work:
<html>
<body>
<script type ="text/javascript">
// Program to replace any spaces in a string of text with the word "spaces".
var str = "Visit Micro soft!";
var result = "";
For (var index = 0; index < str.length ; index = index + 1)
{
if (str.charAt(index)= " ")
{
result = result + "space";
}
else
{
result = result + 开发者_开发知识库(str.charAt(index));
}
}
document.write(" The answer is " + result );
</script>
</body>
</html>
For
isn't capitalized:
for
and
str.charAt(index)= " "
needs to be:
str.charAt(index) == " "
JavaScript Comparison Operators
for loops
As others have mentioned there are a few obvious errors in your code:
- The control flow keyword
formust be all lower-case. - The assignment operator
=is different than the comparison operators==and===.
If you are allowed to use library functions then this problem looks like a good fit for the JavaScript String.replace(regex,str) function.
Another option would be to skip the for cycle altogether and use a regular expression:
"Visit Micro soft!".replace(/(\s)/g, '');
Try this:
str.replace(/(\s)/g, "spaces")
Or take a look at this previous answer to a similar question: Fastest method to replace all instances of a character in a string
Hope this help
You should use the string replace method. Inconvenienty, there is no replaceAll, but you can replace all anyways using a loop.
Example of replace:
var word = "Hello"
word = word.replace('e', 'r')
alert(word) //word = "Hrllo"
The second tool that will be useful to you is indexOf, which tells you where a string occurs in a string. It returns -1 if the string does not appear.
Example:
var sentence = "StackOverflow is helpful"
alert(sentence.indexOf(' ')) //alerts 13
alert(sentence.indexOf('z')) //alerts -1
加载中,请稍侯......
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