How to remove whitespace characters on the left side, right side, whitespace characters on both sides, and all whitespace characters in a string

Sometimes we need to remove the whitespace characters from the string. The following is a method to remove the whitespace characters in various parts. It is actually a routine....

Remove the whitespace characters on the left side of the string

/*
* 去掉字符串开头空白符
* */

function removeBeginBlank(str) {
    return str.replace(/^\s*/g,"");    /* 返回替换后的字符串 */
}
var str = "    hahaha";   /* 要操作的字符串 */
removeBeginBlank(str);

/*
* 去掉字符串开头空白符结束
* */

Remove the whitespace on the right side of the string

/*
* 去掉字符串尾部空白字符
* */
    
function removeTrailBlank(str) {
    return str.replace(/\s*$/g,"");    /* 返回操作得到的字符串 */
}
var str = "hahah  ";   /* 要操作的字符串 */
removeTrailBlank(str);    
    
/*
* 去掉字符串尾部空白字符
* */

Remove the whitespace characters at both ends

/*
* 去掉两端空白字符
* */
    
function remove2PortBlank(str) {
    return str.replace(/^\s*|\s$/g,"");    /* 返回操作得到的字符串 */
}
var str = "hahah  ";   /* 要操作的字符串 */
removeTrailBlank(str);
    
/*
* 去掉两端空白字符
* */

Remove all whitespace characters

/*
* 去掉字符串所有空白符
* */
    
function removeAllBlank(str) {
    return str.replace(/\s*/g,"");    /* 返回操作得到的字符串 */
}
var str = "    hah   aha   ";   /* 要操作的字符串 */
removeAllBlank(str);

/*
* 去掉字符串所有空白符结束
* */

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