you can set the input text-indent property to a negative value to achieve indentation. Text-indent is the distance of the text inside the input to the left, and setting a negative value is the opposite. Indent
$("- sharpinput_text" + nn) .css ("text-indent", "0px") multiple times by following the bad;

for(var i=1;i<20;iPP){
    if(i==1){
        if(text.length>12&&text.length<15){
            $("-sharpinput_text"+nn).css("text-indent","-30px");
        }
    }else{
        var num=12+(i-1)*3;
        var nm=12+i*3;
        if(text.length>=num&&text.length<nm){
            $("-sharpinput_text"+nn).css("text-indent",(-30*i+6*i)+"px");
        }
    }
}