如何通過javascript中的變量來分隔數組中的每個數字？

Question

我需要一個簡單的方式通過一個變量以JavaScript（無jquery的或其他的庫）來劃分陣列中的所有的數字（包含在對象）：

var divisor = 16; 
var array = [{"x":0,"y":16},{"x":16,"y":32},{"x":32,"y":48}]; 

預期結果：

[{"x":0,"y":1},{"x":1,"y":2},{"x":2,"y":3}]; 

有任何想法嗎 ？

Answer 1

這應該爲你做它：

var divisor = 16; 
var array = [{"x":0,"y":16},{"x":16,"y":32},{"x":32,"y":48}]; 

for(var i = 0, length = array.length; i < length; i++){ 
    array[i] = {'x':array[i].x/divisor,'y':array[i].y/divisor}; 
} 

如果你很可能會在未來擴展的對象，你可能要像這樣做，反而：

for(var i = 0, length = array.length; i < length; i++){ 
    array[i].x /= divisor; // `a[i].x /= d` is shorthand for `a[i].x = a[i].x/d` 
    array[i].y /= divisor; 
} 

這具有不覆蓋array[i]的優點，節省了可能的其他屬性。

Answer 2

試試這個

 var divisor = 16; 
     var array = [{"x":0,"y":16},{"x":16,"y":32},{"x":32,"y":48}]; 
     var i=0; 
     for(i=0;i<array.length;i++) 
     { 
      array[i]["y"]=array[i]["y"]/divisor; 
      array[i]["x"]=array[i]["x"]/divisor; 
     } 

Answer 3

另一種解決方案，使用map和回調：

var divisor = 16; 
var array = [{"x":0,"y":16},{"x":16,"y":32},{"x":32,"y":48}]; 

array = array.map(function(v){ 
    return {x: v.x/divisor, y: v.y/divisor}; 
}); 

Answer 4

for (var i = 0; i < array.length; i++) { 
    array[i]["x"] /= divisor; 
    array[i]["y"] /= divisor; 
} 

Answer 5

這是作爲一個功能，使您可以重新使用它。它不限於每個對象只有2個變量。

function divideArray(array, divisor) { 
    var i = array.length, a, k; 
    while (i) { // loop over each item in array 
     a = array[--i]; 
     for (k in a) { // loop over each key in object 
      if (a.hasOwnProperty(k)) { // ignore inherited keys 
       a[k] = a[k]/divisor; // calculate 
      } 
     } 
    } 
    return array; 
} 

// use with your example 
var divisor = 16; 
var array = [{"x":0,"y":16},{"x":16,"y":32},{"x":32,"y":48}]; 
array = divideArray(array, divisor); 

Answer 6

這裏深陷。

var divideBy = function(object, divider) { 
    if (typeof(object) == 'number') return object/divider; 
    for (var i in object) { 
     if (object.hasOwnProperty(i)) { 
      object[i] = divideBy(object[i], divider); 
     } 
    } 
    return object; 
} 

var obj = [{a: 16, b: 32}, {c: 0, d: 48, e: 160}]; 
console.log(divideBy(obj, 16)); 

Answer 7

var divisor = 16; 
    var array = [{"x":0,"y":16},{"x":16,"y":32},{"x":32,"y":48}]; 
    var i=0; 
    for(i=0;i<array.length;i++) 
    { 
     array[i]["y"]=array[i]["y"]/divisor; 
     array[i]["x"]=array[i]["x"]/divisor; 
    }