Javascript:如何用单个替换多个空格 [英] Javascript: how to replace multiple spaces with single
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问题描述
在输入中我写了多个空格的任何句子,点击Space Remover按钮后,我需要用单个替换多个空格并用h1标签显示它。
我尝试了什么:
我试过这样的,但它不起作用。
In input i write any sentence with multiple spaces,after clicking on Space Remover button,i need to replace that multiple spaces with single and show it in h1 tag.
What I have tried:
I have tried like this, but it's not working.
<input id="bar" type="text" placeholder="Type a sentence...">
<button onclick="spaceremover()">Space Remover</button>
<h1 id="result1"></h1>
function spaceremover(){
var a = document.getElementById("bar").value;
for(var i = 0; i < a.length;i++){
a.replace(/\s/g, ' ');
}
document.getElementById("result1").innerHTML = a;
}
推荐答案
您的正则表达式
仅替换单个空格字符(\s
)只有一个空格。要匹配多个空格的序列,您必须通过附加+
(匹配一个或多个出现)或{2,} $来指定c $ c>(匹配两个或多个出现)。
使用正则表达式全局选项时也不需要使用循环。
最后, String.prototype .replace() - JavaScript | MDN [ ^ ]函数返回一个新的字符串,其中已执行替换,但不会改变原始字符串
所以使用(未经测试):
Yourregex
replaces only single white space characters (\s
) with a single space. To match sequences of multiple spaces, you have to specify that by appending a+
(match one or more occurences) or{2,}
(match two or more occurences).
There is also no need to use a loop when using the regex global option.
Finally, the String.prototype.replace() - JavaScript | MDN[^] function returns a new string where the replacement has been performed but does not alter the original string
So use (untested):
function spaceremover(){
var a = document.getElementById("bar").value;
document.getElementById("result1").innerHTML = a.replace(/\s{2,}/g, ' ');
}
你可以使用
.replace(/\d+/, '')
或
or
.split('/\d+/').join(' ')
.split(' ').join(' ')
或
or
str.replace( /\s\s+/g, ' ' )
或
or
var str = " Hello World! ";
alert(str.trim());
这个案例最常用的是
and this one most used in this case
myStr.replace(/ +/g, ' ')
这是值得的。
it would be worthful.
var myStr = 'The quick brown fox';
alert(myStr); // Output 'The quick brown fox'
var newStr = myStr.replace(/ +/g, ' ');
alert(newStr); // Output 'The quick brown fox'
document.getElementById(result1)。innerHTML = newStr;
document.getElementById("result1").innerHTML = newStr;
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