编辑代码

//输入两个字符串，查找最长字串
function findMaxStr(txt1,txt2){
    let chidStr = new Set()
    for(let i = 0 ;i<txt1.length ; i++){
        for(let j = 0 ;j<txt1.length ; j++){
            let rundomStr = ""
            if(j<i){
                rundomStr = txt1.substr(j,i+1)
            }else {
                rundomStr = txt1.substr(i,j+1)
            }
            if(rundomStr.length>0 && txt2.indexOf(rundomStr+"")>=0){
                chidStr.add(rundomStr.toString())
            }
        }

    }
    let arrayStr = [...chidStr]
    arrayStr.sort(function (a,b){
        return b.length - a.length
    })
    console.log(chidStr)
    console.log(arrayStr[0])

}
// findMaxStr('hello123word','hello123abc4')
// findMaxStr('hiword','hiweb')
// findMaxStr('private_void_method','public_void_method')
findMaxStr('h12hd',',12etd')