字符串分割

indexOf: 检测出当前字符在字符串中第一次出现位置的索引
split : 按照某一个字符把字符串拆分成数组中的每一项
方法1 字符串分割法

   let url='https://www.baidu.com/s?ie=UTF-8&wd=baidu'
        function queryURLParameter(url){
            let obj={}
            if(url.indexOf('?')<0) return obj;
            let array=url.split('?')
            url=array[1]
            array=url.split('&')

            for (let i = 0; i < array.length; i++) {
               let cur=array[i],
               curAry=cur.split('=');
               obj[curAry[0]]=curAry[1]
               return obj;
        }
    queryURLParameter(url)     
   

方法2 正则判断

   let url='https://www.baidu.com/s?ie=UTF-8&wd=baidu'
        function queryURLParameter(url){
               let reg=/([^?=&]+)=([^?=&]+)/g,obj={};
            url.replace(reg,function(){
                obj[arguments[1]]=arguments[2];
            });
    queryURLParameter(url)     

字符串转数组格式

let arr="小名,小妹，小俪"
let arr1=arr.split(',')
console.log(arr1)  // "arr1":["小名","小妹" ,"小俪"],