The first type: loop check replacement
//For the user to call function trim(s){ return trimRight(trimLeft(s)); } //Remove the blank on the left function trimLeft(s){ if(s == null) { return ""; } var whitespace = new String(" /t/n/r"); 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 on the right www.VeVB.COM function trimRight(s){ if(s == null) return ""; var whitespace = new String(" /t/n/r"); 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; }The second type: regular replacement
<SCRIPT LANGUAGE="JavaScript"> <!-- String.prototype.Trim = function() { return this.replace(/(^/s*)|(/s*$)/g, ""); } String.prototype.LTrim = function() { return this.replace(/(^/s*)/g, ""); } String.prototype.RTrim = function() { return this.replace(/(/s*$)/g, ""); } //--> </SCRIPT> //Remove the left space; function ltrim(s){ return s.replace(/(^/s*)/g, "");}//Remove the right space; function rtrim(s){ return s.replace(/(/s*$)/g, "");}//Remove the left and right spaces; function trim(s){ return s.replace(/(^/s*)|(/s*$)/g, "");}The third type: use jquery
$.trim(str)
The internal implementation of jquery is:
function trim(str){ return str.replace(/^(/s|/u00A0)+/,'').replace(/(/s|/u00A0)+$/,''); }Fourth: Use motools
function trim(str){ return str.replace(/^(/s|/xA0)+|(/s|/xA0)+$/g, ''); }Fifth: Cropping strings
function trim(str){ str = str.replace(/^(/s|/u00A0)+/,''); for(var i=str.length-1; i>=0; i--){ if(//S/.test(str.charAt(i))){ str = str.substring(0, i+1); break; } } return str; } //----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- (vRet.lastIndexOf (' ') == parseInt(vRet.length) - 1)) { vRet = vRet.substring(0, parseInt(vRet.length) - 1); } else { return vRet; } }}The above is the entire content of this article. For more information about JavaScript, you can check out: "JavaScript Reference Tutorial" and "JavaScript Code Style Guide". I also hope that everyone will support Wulin.com more.