javascript - 使用 for 循环查找另一个字符串中的一个字符串

Question

我不明白为什么我的循环无法找到 textToSearch 中出现的每个 myName。如果它靠近 textToSearch 的开头，它只能找到一个匹配项。

var textToSearch = "Aaron blue red Aaron green Aaron yellow Aaron";
var myName = "Aaron";
var hits = [];
for(i = 0; i < textToSearch.length; i++){
   if(textToSearch.substring(i, myName.length) === myName){ 
     hits.push(textToSearch.substring(i, myName.length));
   }
}
if(hits.length === 0){
   console.log("Your name wasn't found!");
} else {
   console.log("Your name was found " + hits.length + " times.");
   console.log(hits);
}

Answer 1

您需要从 i 到 i + myName.length 进行子字符串化。

var textToSearch = "Aaron blue red Aaron green Aaron yellow Aaron";
var myName = "Aaron";
var hits = [];
for(var i = 0; i < textToSearch.length; i++){
   if(textToSearch.substring(i, i + myName.length) === myName){ 
     hits.push(textToSearch.substring(i, i + myName.length));
   }
}
if(hits.length === 0){
   console.log("Your name wasn't found!");
} else {
   console.log("Your name was found " + hits.length + " times.");
   console.log(hits);
}

顺便说一句，有更好的方法来计算出现次数

var textToSearch = "Aaron blue red Aaron green Aaron yellow Aaron";

console.log((textToSearch.match(/Aaron/g) || []).length)