1

我想动态生成一个整数（在以下情况下为 100 或 500）并使用它来访问单独的数组。在后面的步骤中（不是下面代码的一部分），我还想以相同的方式访问这些数组的不同部分（“消息 1、2 或 3”）。

对于这个概念证明，我没有动态生成整数，而是将其设置为 100。

然后我尝试使用eval()动态生成由“警告”和100组成的数组名称，但它无法正常工作。

这是我的代码：

// two arrays are defined, warning100 and warning500
var warning100 = [
    { "message1":"Ok, go ahead and start typing!" },
    { "message2":"Keep going!" },
    { "message3":"You can do it!" }
];

var warning500 = [
    { "message1":"Slow down..." },
    { "message2":"That's it!" },
    { "message3":"Maximum reached." }
];

// set i to 100 and h to 1 for testing purposes, will be random integers in the final version
var i = 100;
var h = 2;
// create variable names as a combination of a string and i or h
// those variables will be used to access one of the arrays from above and one of the messages;
eval("var warningNumber = warning" + i + ";");
eval("var messageNumber = message" + h + ";");

/* alternative code for creating the two variable values
var warningNumber = "warning" + i;
var messageNumber = "message" + h;
*/

// the variable warningNumber from above is now used again to access the array warning100
// the varaible messageNumber is used to access one of the messages
// within that array message1 should be displayed
// create variable to be used in the document.write below
var warning = warningNumber[0].messageNumber;

// should alert "Ok, go ahead and start typing!"    
alert(warning);
4

3 回答 3

1

为什么不把每组警告都作为 warningNumber 对象的一部分呢？这样你就可以做到

var warnings = {100: { 1:"Ok, go ahead and start typing!",
                       2:"Keep going!",
                       3:"You can do it!"
                     },
                500: { 1:"Slow down...",
                       2:"That's it!",
                       3:"Maximum reached."
                     }
               };
alert(warnings[i][h]);

这样，甚至不必完成所有评估。

于 2012-10-15T15:10:35.170 回答
0

为什么不把它包装在一个对象中呢？

var dynamicHolder = {};
var i = 100;
var h = 2;
dynamicHolder["warningNumber"] = "warning" + i;
dynamicHolder["messageNumber"] = "message" + h;
于 2012-10-15T15:27:43.443 回答
-1

试试这个：

var warnings = {

    warning100: {
        "message1":"Ok, go ahead and start typing!",
        "message2":"Keep going!",
        "message3":"You can do it!"
    },
    warning500: {
        "message1":"Slow down...",
        "message2":"That's it!",
        "message3":"Maximum reached."
    }
}

var i = 100;
console.log( warnings["warning" + i] );
i += 400;
console.log( warnings["warning" + i] );

console.log( warnings["warning" + i ]["message1"] );

例子

于 2012-10-15T15:08:09.203 回答