问JavaScript to fixed方法

EN

$(document).ready(function(){

var inputs=[""];

var totalString;

var operators1=["+", "-", "/", "*"];
//opertors array with the . for validation
var operators2=["."];

var nums = [0,1,2,3,4,5,6,7,8,9];

function getValue(input){
if(operators2.includes(inputs[inputs.length-1])===true && input==="."){
  console.log("Duplicate '.'");
}
else if(inputs.length===1 && operators1.includes(input)===false)
        {
          inputs.push(input);
        }
else if(operators1.includes(inputs[inputs.length-1])===false){
  inputs.push(input);
}
else if(nums.includes(Number(input))){
  inputs.push(input);
}
update();
}
function update(){
totalString = inputs.join("");
$("#steps").html(totalString);
console.log(inputs);
}
function getTotal(){
totalString = inputs.join("");
$("#steps").html(eval(totalString));

}
$("a").on("click", function(){
if(this.id==="deleteAll"){
  inputs=[""];
  update();
}
else if(this.id==="backOne"){
  inputs.pop();
  update();

}
else if(this.id==="total"){
  getTotal();

}

else{

  if(inputs[inputs.length-1].indexOf("+","-","/","*")===-1)
  {
    getValue(this.id);
  }
    else
    {
      getValue(this.id);
    }
}
});

});