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                            ![](https://img.kancloud.cn/48/2c/482c6362fb45965e8fe977d8a95a1b7f_1138x102.png)

~~~
~ function () {
    // function myIndexOf(T) {
    //     let lenT = T.length,
    //         lenS = this.length,
    //         res=-1;
    //     if(lenT > lenS) return -1;
    //     for (let i = 0; i < lenS - lenT; i++) {
    //         let char = this[i];
    //         if(this.substr(i,lenT) === T){
    //             res = i;
    //             break;
    //         }
    //     }
    //     return res;
    // }

    function myIndexOf(T) {
        let reg = new RegExp(T),
            res = reg.exec(this);
        return res ===null ? -1 : res.index;
    }
    String.prototype.myIndexOf= myIndexOf;
}();

let S = "zhufengpeixun";
    T = "pei";
    console.log(S.myIndexOf(T));

~~~
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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