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js trim function, space removal function and regular collection_javascript skills
js trim function, space removal function and regular collection_javascript skills
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Release: 2016-05-16 18:41:34
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But if the project does not use a framework such as jQuery, js itself does not have such a function, and we have to write such a function ourselves. The following is the specific implementation of the function:
//For users to call function trim(s){ return trimRight(trimLeft(s)); } //Remove the left whitespace function trimLeft(s){ if(s == null) { return ""; } var whitespace = new String(" tnr"); var str = new String(s); if (whitespace.indexOf(str.charAt(0)) != -1) { var j=0, i = str.length; while (j < i && whitespace.indexOf(str.charAt(j)) != -1){ j ; } str = str.substring (j, i); } return str; } //Remove the blank space on the right function trimRight(s){ if(s == null) return " "; var whitespace = new String(" tnr"); var str = new String(s); if (whitespace.indexOf(str.charAt(str.length-1)) != -1){ var i = str.length - 1; while (i >= 0 && whitespace.indexOf(str.charAt(i)) != -1){ i-- ; } str = str.substring(0, i 1); } return str; }
When using, just call the trim function That’s it. The following is the implementation method using regular expressions:
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