如何串联。 （点）编号为 javascript

Question

hi ive created visual calc using html and its looks like this..

| 1  | 2  | 3 | 
| 4  | 5  | 6 | 
| 7  | 8  | 9 | 
|    | .  |   |

and ive created function called number() on click on each html element and this is it

number(number)
{
    this.total_quantity_discount_price = this.total_quantity_discount_price+''+number;
    this.total_quantity_discount_price = parseFloat(this.total_quantity_discount_price);
},

with numbers 0123456789 everything is working fine but my problem with the . how can i add . to this.total_quantity_discount_price i mean how can i add the number 10.555 or 55.648 ect.. thanks..

Answer 1

Use Number constructor like

this.total_quantity_discount_price = Number(this.total_quantity_discount_price+''+number);

 let n=Number(4+'.'+5) // the n is a number which you could add it to another console.log(n) console.log(n+1) console.log(n-3)

Answer 2

You can use the + operator like this:

 const n = '4' + '.' + '3' + '4'; console.log(+n); console.log(+n + 1); console.log(+n - 1);

You function will become something like:

function number(number){
  this.total_quantity_discount_price = +(this.total_quantity_discount_price + '' + number);
}

Answer 3

You can concat everything together and parse it with new Function()

 let result = ""; let calc = document.getElementById("calculation"); let output = document.getElementById("result"); document.querySelectorAll("button").forEach(el => { el.addEventListener("click", ()=> { result += el.innerHTML; output.innerHTML = result; }) }) function render() { let calcResult = interprete(result); output.innerHTML = calcResult; } function getResult() { output.innerHTML = interprete(result); } function clearResult() { output.innerHTML = ""; result = ""; } function back () { result = result.slice(0, -1); output.innerHTML = result; } function interprete(str) { return new Function(`return ${str}`)() }

 .buttonholder { display: flex; flex-flow: wrap; width: 170px; } button { display: block; margin: 2px; padding: 15px; }.box { cursor: pointer; background: black; color: white; padding: 10px; margin: 10px; } #result { background: green; color: white; padding: 10px; }

 <div class="buttonholder"> <button>1</button> <button>2</button> <button>3</button> <button>4</button> <button>5</button> <button>6</button> <button>7</button> <button>8</button> <button>9</button> <button>.</button> <button>+</button> <button>-</button> <button>*</button> <button>/</button> </div> <div class="box" onclick="back()"> <== </div> <p id="result"></p> <div class="box" onclick="getResult()">=</div> <p id="calculation"></p> <div class="box" onclick="clearResult()">Clear</div>