008-String to Integer (atoi).js.md

LeetCode-008
思路：意外终结求解过程，计算求解结果

/**
* @param {string} str
* @return {number}
*/
var myAtoi = function(str) {
   var numString = false;
   var first = false;
   var pre = 0;
   var sign = 0;
   var result = 0;
   for(var i in str){
       if('0'<=str[i] && str[i]<='9') {
           if(!first) first = true;
           else if(pre != i - 1) 
               // return result*(sign>-1?1:-1) > 2147483647?2147483647:result*(sign>-1?1:-1);
               break;
           result = result * 10 + (str[i] - '0');
           pre = i;
       } else if(str[i] === '+' || str[i] === '-'){
           if(sign) return 0;
           else sign = str[i] === '+' ? 1 : -1;
           pre = i;
           first = true;
       }else if(str[i] !==' ') {
           break;
       }
       //console.log(result)
   }
   return ((result - 2147483647 > 0 ? (2147483647 + ((sign>-1)?0:1)) : result) )*(sign>-1?1:-1);
};