Question

我有2个阵列：

A1=[num1,num2,num3]

B1=[digit1,digit2,digit3]

我想创建一个函数：

获取digit1，digit2和digit3并将其与A1 elements进行比较，然后执行以下操作：

if(digit1>num1)
//draw next page

else if(digit1<num1)
//go to previous page

else if(digit1==num1)
//go and check "digit2" with "num2"

if(digit2>num2)
//draw next frame

else if(digit2<num2)
//remove the latest frame added

else if(digit2==num2)
//got check "digit3" with "num3"

if(digit3>num3)
//draw a div

else if(digit3<num3)
//remove the previous div added

else if(digit3==num3)
//some statement

有什么方法可以避免所有这些“if-else”并使用for循环来实现这个？

Answer 1

if( A1.length == B1.length ) {
   for(var i = 0; i < A1.length ; i++) {
     if( A1[i] > B1[i] )
       //some statement
     else if( A1[i] < B1[i] )
       //some statement
     else if( A1[i] == B1[i] )
       //some statement
   }
}

Answer 2

虽然@Notulysses答案已经是一个好的开始，但你可以像这样增强你的逻辑：

var dialogs = [  // an indexed Array of the dialogs

    {  // first dialog
        num: 0,
        digit: 0,
        greaterFun: function () {
            // statement if greater than
        },
        lowerFun: function () {
            // statement if lower than
        },
        equalityFun: function () {
            // statement when this.num === this.digit
        }
    }

    /*, {  // second dialog
        num: 1,
        digit: 1,
        greaterFun: function () {
            // statement if greater than
        },
        lowerFun: function () {
            // statement if lower than
        },
        equalityFun: function () {
            // statement when this.num === this.digit
        }
    } */

];

用法

for (var i = 0; i < dialogs.length; i++) {
    var dialog = dialogs[i];

    if (dialog.digit > dialog.num) {
        dialog.greaterFun();
    }
    else if (dialog.digit < dialog.num) {
        dialog.lowerFun();
    }
    else if (dialog.digit === dialog.num) {
        dialog.equalityFun();
    }
    else {
        // handle an error
    }
}

使用for循环javascript比较数组的元素

2 个答案: