Cloudant 中的 JS trim() 函数

Question

I've built a search index in Cloudant. I use trim() to remove space in string. However, it does not work.

How can I do this?

Update:

I have a JSON object

...
    "attributeArray": [
      {
        "name": "this is  a       web     authentication"
      }
    }
...

I already extracted "name" successfully. I want to remove space in "name" then make a search index for the document. Supposing "name" has already been extracted.

var index=name.trim();
Index("default", index);

When I query, the system shows:

{
"id": "06xxxx",
"fields": [
" this is  a       web     authentication"
]
}

I conclude that the function trim() does not work.

PS: A small question so it does not need to explain in whole thing.

Answer 1

By definition, the trim() function will only remove leading and trailing white-space within a string, which may not be what you need in this scenario.

If you want to remove all white-space in general, you could consider using a Regular Expression replacement via the replace() function:

// This will remove all white-space from your input string
var output = input.replace(/\s/g,'');

After Your Update

Your code looks a bit more like you want to replace multiple instances of a space with a single space, which can still be done by a slightly different expression than the original :

// This replaces multiple repeated instances of a space with a single
var trimmedName = name.replace(/\s+/g,' ');
Index("default", trimmedName);

Answer 2

trim() 函数只会删除字符串的前导和尾随空格，不会删除字符串单词之间的空格

Answer 3

Are you making sure that you're re-assigning your variable after the trim() ?

var test = "   Hello World   ";

test = test.trim(); // "Hello World"