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JavaScript判断前缀、后缀是否是空格的方法_javascript技巧

WBOY
WBOYOriginal
2016-05-16 16:03:531416browse

本文实例讲述了JavaScript判断前缀、后缀是否是空格的方法。分享给大家供大家参考。具体如下:

// Js 判断后缀 
String.prototype.endsWith = function(suffix) { 
 return this.indexOf(suffix,this.length - suffix.length)!==-1; 
}; 
 
// Js 判断前缀
if (typeof String.prototype.startsWith != 'function') {
 // see below for better implementation!
 String.prototype.startsWith = function (str){
 return this.indexOf(str) == 0;
 };
} 
  
// Js 判空(含全部是空格)
String.prototype.IsNullEmptyOrSpace = function() 
{  
  if (this== null) return true; 
  return this.replace(/s/g, '').length == 0; 
};

希望本文所述对大家的javascript程序设计有所帮助。

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