An example tutorial summarizing JavaScript string retrieval characters

This article mainly introduces the method of retrieving characters in JavaScript string in detail. It has a certain reference value. Interested friends can refer to

in strings. There are several ways to search for characters in for your reference. The specific contents are as follows

var text="abcdefgh你好，很高兴认识你！";
 var str1="abc";
 var str2="def";
 var str3="ABC";
 var str4="很高兴";
 function isContain(str,substr){
  return new RegExp(substr).test(str);
 }
 console.log(isContain(text,str1));//true
 console.log(isContain(text,str4));//true

 console.log(text.indexOf(str1));//0，如果匹配则返回其位置
 console.log(text.indexOf(str2));//3
 console.log(text.indexOf(str4));//11
 console.log(text.indexOf(str3));//-1,如果不匹配则返回-1
 console.log(text.indexOf(str1,1));//-1 第二个参数表示从下标为1的地方开始找

 console.log(text.lastIndexOf(str1,1));//0,从后向前检索，返回其下标
 console.log(text.lastIndexOf(str2));//3

 console.log(text.substring(0,5));
 //abcde 提取下标之间的字符串，包括第一个参数，不包括第二个参数

 console.log(text.slice(0,5));//abcde 根substring作用基本相同

 console.log(text.substr(0,3));//abc，第一个参数表示起始下标，第二个参数表示获取的字符长度


 console.log(text.match(str1));//返回abc数组，可以使用正则，进行了解
 console.log(text.match(str1)[0]);//abc

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