Home Web Front-end JS Tutorial Example analysis of common methods of String in Javascript_javascript skills

Example analysis of common methods of String in Javascript_javascript skills

May 16, 2016 pm 03:55 PM
javascript string Common methods

The examples in this article describe the common methods of String in Javascript. Share it with everyone for your reference. The details are as follows:

// length属性:获取字符串的字符个数。
  var s='爱像一阵风';
  alert(s.length);
// charAt(index)方法:获取指定索引位置的字符,索引从0开始
  var s1='我不要再想你';
  alert(s1.charAt(4));//想
// indexOf('e',startIndex)方法:获取指定字符串第一次出现的位置。startIndex表示从第几个开始搜索。
  var s2='后知过后觉又过了一个秋';
  alert(s2.indexOf('过',3));//6
// split('分隔符',limit);根据分隔符将一个字符串返回为一个数组。
//limit表示要返回的数组的最大长度(可自定义)。
  var s3='快马|在江湖里|厮杀';
  alert(s3.split('|',2));
//以|为分隔,将字符串劈开,显示为数组,且只包含两个元素
  var arr=s3.split('|',3);//三个元素
  for(var i=0;i<arr.length;i++){
  alert(arr[i]);
  }
// substr(startIndex,len)从startIndex开始(包括),往后截取len个字符。
  var s4='一件黑色毛衣';
  alert(s4.substr(4,2));//毛衣,从下标4开始包括4,往后截取两个字符
// substring(startIndex,stopIndex)从startIndex开始,
// 截取到stopIndex位置(不包括stopIndex所在的字符)
  var s5='烟花易冷人事易分';
  alert(s5.substring(1,4));//花易冷,从1开始到4,不包括1和4
// toUpperCase()转换大写、toLowerCase();转换小写
  var s6='What are you kidding me';
  alert(s6.toUpperCase());
  alert(s6.toLowerCase());

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I hope this article will be helpful to everyone’s JavaScript programming design.

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