Javascript javascript需要做一个正确的修剪
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javascript need to do a right trim
提问by Nate Pet
In javascript, how to I do a right trim?
在 javascript 中，如何进行正确的修剪？
I have the following:
我有以下几点：
var s1 = "this is a test~";
var s = s1.rtrim('~')
but was not successful
但没有成功
回答by Rob W
Use a RegExp. Don't forget to escape special characters.
使用正则表达式。不要忘记转义特殊字符。
s1 = s1.replace(/~+$/, ''); //$ marks the end of a string
// ~+$ means: all ~ characters at the end of a string
回答by Scott A
There are no trim, ltrim, or rtrim functions in Javascript. Many libraries provide them, but generally they will look something like:
Javascript 中没有trim、ltrim 或rtrim 函数。许多图书馆都提供它们，但通常它们看起来像：
str.replace(/~*$/, '');
For right trims, the following is generally faster than a regex because of how regex deals with end characters in most browsers:
对于正确的修剪，由于大多数浏览器中正则表达式处理结束字符的方式，以下通常比正则表达式更快：
function rtrim(str, ch)
{
for (i = str.length - 1; i >= 0; i--)
{
if (ch != str.charAt(i))
{
str = str.substring(0, i + 1);
break;
}
}
return str;
}
回答by JP Richardson
You can modify the String prototype if you like. Modifying the String prototype is generally frowned upon, but I personally prefer this method, as it makes the code cleaner IMHO.
如果您愿意，可以修改 String 原型。修改 String 原型通常是不受欢迎的，但我个人更喜欢这种方法，因为它使代码更简洁恕我直言。
String.prototype.rtrim = function(s) {
return this.replace(new RegExp(s + "*$"),'');
};
Then call...
然后打电话...
var s1 = "this is a test~";
var s = s1.rtrim('~');
alert(s);
回答by wutz
A solution using a regular expression:
使用正则表达式的解决方案：
"hi there~".replace(/~*$/, "")
回答by Javid
IMO this is the best way to do a right/left trim and therefore, having a full functionality for trimming (since javascript supports string.trimnatively)
IMO 这是进行右/左修剪的最佳方式，因此具有完整的修剪功能（因为 javascriptstring.trim本身支持）
String.prototype.rtrim = function (s) {
if (s == undefined)
s = '\s';
return this.replace(new RegExp("[" + s + "]*$"), '');
};
String.prototype.ltrim = function (s) {
if (s == undefined)
s = '\s';
return this.replace(new RegExp("^[" + s + "]*"), '');
};
Usage example:
用法示例：
var str1 = ' jav '
var r1 = mystring.trim(); // result = 'jav'
var r2 = mystring.rtrim(); // result = ' jav'
var r3 = mystring.rtrim(' v'); // result = ' ja'
var r4 = mystring.ltrim(); // result = 'jav '
回答by JJ McKool
str.trimEnd();
str.trimRight();
These are currently stage 4 proposals expected to be part of ES2019. They work in NodeJS and several browsers.
这些目前是第 4 阶段的提案，预计将成为 ES2019 的一部分。他们在 NodeJS 和几个浏览器中工作。
See below for more info:
请参阅下文了解更多信息：
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/trimEnd
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/trimEnd
回答by 100PercentVirus
This removes a specified string or character from the right side of a string
这将从字符串的右侧删除指定的字符串或字符
function rightTrim(sourceString,searchString)
{
for(;;)
{
var pos = sourceString.lastIndexOf(searchString);
if(pos === sourceString.length -1)
{
var result = sourceString.slice(0,pos);
sourceString = result;
}
else
{
break;
}
}
return sourceString;
}
Please use like so:
请像这样使用：
rightTrim('sourcecodes.....','.'); //outputs 'sourcecodes'
rightTrim('aaabakadabraaa','a'); //outputs 'aaabakadabr'
回答by Joshua Davison
This is old, I know. But I don't see what's wrong with substr...?
这是旧的，我知道。但我不明白 substr 有什么问题...？
function rtrim(str, length) {
return str.substr(0, str.length - length);
}
