The function that can remove leading and trailing whitespace from a string at the same time is: trim(). The trim() function is used to delete the leading and trailing whitespace characters of a string. The whitespace characters include: spaces, tabs, newlines and other whitespace characters; its syntax format is "string.trim()".
The operating environment of this tutorial: Windows 7 system, ECMAScript version 5, Dell G3 computer.
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JavaScript trim()
trim() method is used to delete characters The whitespace characters at the beginning and end of the string include: spaces, tabs, newlines and other whitespace characters.
The trim() method does not change the original string.
trim() method is not applicable to null, undefined, Number types.
Syntax
string.trim()
Return value: Returns a string with leading and trailing spaces removed.
Example:
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
</head>
<body>
<p>点击按钮移除字符串的头尾空格。</p>
<button onclick="myFunction()">点我</button>
<script>
function myTrim(x) {
return x.replace(/^\s+|\s+$/gm,'');
}
function myFunction() {
var str = myTrim(" hello ");
alert(str);
}
</script>
</body>
</html>For more programming-related knowledge, please visit: Programming Learning! !
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