编辑代码

// 蛮力字符串匹配

const source = 'NOBODY-NOTICED_HIMI'

const str = 'NOTIC' // want to get six
/**
 * 第一个匹配子串最左的下标
 */
function stringMatching(text,pattern){
  const textLength = text.length;
  const patternLength = pattern.length;

  for (let i = 0; i <= textLength - patternLength; i++) {
    let j;
    for (j = 0; j < patternLength; j++) {
        console.log(text[i+j],pattern[j])
      if (text[i + j] !== pattern[j]) {
        break;
      }
    }
    console.log("循环结束")
    if (j === patternLength) {
      return i; 
    }
  }
  
  return -1; 
}

console.log(stringMatching(source,str))