function s1Func(){ var s1Str = "abcdefg"; var s1IndexOf = s1Str.indexOf("e"); console.log(s1IndexOf);//4 }
function s2Func(){ var s2Str = "sample2 String"; console.log(s2Str.indexOf("String"));//8 }
var a = "string"; var b = "d"; function s3Func01(){ if(a.indexOf(b) != -1){ console.log("一致"); } else { console.log("一致しない"); } }//しない function s3Func02(){ if(a.indexOf("i") != -1){ console.log("一致"); } else { console.log("一致しない"); } }//する