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s1、s2為字符串類型，寫一個函數返回s1、s2開頭部分相同的字符數
~~~
function fiterStr(str1,str2){
    var l = str1.length > str2.length ? str2.length : str1.length, //取短的
        i = 0
    while(i < l){
        if(str1[i] !== str2[i]){
        break;}
        i++
    }
    return str1.substr(0,i)
}
fiterStr('ssd','sss'); 
~~~
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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