Question

如果我想简化以下内容：

if ($rootScope.map.visible == 0 && $rootScope.user == $rootScope.mapuser) {
    var owner = "me";
} else if ($rootScope.map.visible == 1) ) {
    var owner = "me";
} else {
    var owner = "you";
}

这会有用吗？

if ( ($rootScope.map.visible == 0 && $rootScope.user == $rootScope.mapuser) || ($rootScope.map.visible == 1) ) {
    var owner = "me";
} else {
    var owner = "you";
}

Answer 1

这些陈述看起来与我相等。你可以用卡诺图来证明它：

A = $rootScope.map.visible == 0
B = $rootScope.user == $rootScope.mapuser
C = $rootScope.map.visible == 1
D = A & B
E = D || C

A    B    C    D    E    
=====================
F    F    F    F    F
F    F    T    F    T
F    T    F    F    F
F    T    T    F    T
T    F    F    F    F
T    F    T    F    T
T    T    F    T    T
T    T    T    T    T

如果E == False，那么所有者=“你的”

如果E == True则所有者=“我”

Answer 2

您实际上可以使用ternary operator并在一行代码中完成相同的操作：

var owner = $rootScope.map.visible==1 || 
            ($rootScope.map.visible==0 && $rootScope.user==$rootScope.mapuser) ? 
            "me" : "you";

或者，如果$rootScope.map.visible的唯一可能值为0和1（看起来很可能是变量的名称）：

var owner = $rootScope.map.visible || $rootScope.user==$rootScope.mapuser?"me":"you";

JavaScript if语句的组合

2 个答案: