function disposeNumber(value){    if(value == null || value == ""){        return 0;    }else if(value.toString().indexOf(".") == -1){        return value;    }else{        return round(value, 2);    }}function round(v,e){    var t=1;    for(;e>0;t*=10,e--);    for(;e<0;t/=10,e++);    return Math.round(v*t)/t;}console.log(disposeNumber(0.1*0.2))