Write a function to find the longest common prefix string amongst an array of strings.
寻找最长公共前缀
let longestCommonPrefix = (strs)=>{
if(strs[0]===undefined){
return ''
}
let ans = []
for(let i=0;i<strs[0].length;i++){
let _char = strs[0][i]
let tag = true
for(let j=0;j<strs.length;j++){
if(_char !== strs[j][i]){
tag = false
}
}
if(tag){
ans.push(_char)
}else{
break
}
}
return ans.join('')
}
console.log(longestCommonPrefix(['123','12']))
console.log(longestCommonPrefix([]))
console.log(longestCommonPrefix(['123123']))
console.log(longestCommonPrefix(['123123','12']))