Question

如何在JSON中使用if语句以下是代码： .................................................. .....................................

var config =
             [
                {
                    "name"      : "SiteTitle",
                    "bgcolor"   : "",
                    "color"     : "",
                    "position"  : "TL",
                    "text"      : "step1",
                    "time"      : 5000
                },
                {
                    "name"      : "Jawal",
                    "bgcolor"   : "",
                    "color"     : "",
                    "text"      : "step2",
                    "position"  : "BL",
                    "time"      : 5000
                },
                {
                    "name"      : "Password",
                    "bgcolor"   : "",
                    "color"     : "",
                    "text"      : "step3",
                    "position"  : "TL",
                    "time"      : 5000
                }
            ],

            //define if steps should change automatically
            autoplay    = false,
            //timeout for the step
            showtime,
            //current step of the tour
            step        = 0,
            //total number of steps
            total_steps = config.length;

这是必需的结果：

    var config =
         [

    if(page==true)  {               
            {
                "name"      : "SiteTitle",
                "bgcolor"   : "",
                "color"     : "",
                "position"  : "TL",
                "text"      : "step1",
                "time"      : 5000
            },
            {
                "name"      : "Jawal",
                "bgcolor"   : "",
                "color"     : "",
                "text"      : "step2",
                "position"  : "BL",
                "time"      : 5000
            }
    } else {
            {
                "name"      : "Password",
                "bgcolor"   : "",
                "color"     : "",
                "text"      : "step3",
                "position"  : "TL",
                "time"      : 5000
            }
    }
        ],

            //define if steps should change automatically
            autoplay    = false,
            //timeout for the step
            showtime,
            //current step of the tour
            step        = 0,
            //total number of steps
            total_steps = config.length;

实际上这种方法是错误的并且会导致JavaScript语法错误。

Answer 1

通过验证JSON Schema Draft-07，JSON现在支持if...then...else关键字用于条件数据表示。

{
    "type": "integer",
    "minimum": 1,
    "maximum": 1000,
    "if": { "minimum": 100 },
    "then": { "multipleOf": 100 },
    "else": {
        "if": { "minimum": 10 },
        "then": { "multipleOf": 10 }
    }
}

Answer 2

这是常规JavaScript，而不是JSON。将if语句移到外面：

if (page) {
    var config = [
        {
            "name"      : "SiteTitle",
            "bgcolor"   : "",
            "color"     : "",
            "position"  : "TL",
            "text"      : "step1",
            "time"      : 5000
        }, {
            "name"      : "Jawal",
            "bgcolor"   : "",
            "color"     : "",
            "text"      : "step2",
            "position"  : "BL",
            "time"      : 5000
        }
    ];
} else {
    var config = [
        {
            "name"      : "Password",
            "bgcolor"   : "",
            "color"     : "",
            "text"      : "step3",
            "position"  : "TL",
            "time"      : 5000
        }
    ];
}

Answer 3

或者也许这样：

 var config =
  (page == true) ?
     [             
        {
            "name"      : "SiteTitle",
            "bgcolor"   : "",
            "color"     : "",
            "position"  : "TL",
            "text"      : "step1",
            "time"      : 5000
        },
        {
            "name"      : "Jawal",
            "bgcolor"   : "",
            "color"     : "",
            "text"      : "step2",
            "position"  : "BL",
            "time"      : 5000
        }
  :
        {
            "name"      : "Password",
            "bgcolor"   : "",
            "color"     : "",
            "text"      : "step3",
            "position"  : "TL",
            "time"      : 5000
        }
    ];

Answer 4

你也可以这样做（不是说这是最好的方式，但它是另一种方式，在某些情况下可能有用）

let config = [];
if (page) {
   config.push({
        "name"      : "SiteTitle",
        "bgcolor"   : "",
        "color"     : "",
        "position"  : "TL",
        "text"      : "step1",
        "time"      : 5000
    });
   config.push({
        "name"      : "Jawal",
        "bgcolor"   : "",
        "color"     : "",
        "text"      : "step2",
        "position"  : "BL",
        "time"      : 5000
    });
} else {
    config.push({
        "name"      : "Password",
        "bgcolor"   : "",
        "color"     : "",
        "text"      : "step3",
        "position"  : "TL",
        "time"      : 5000
    });
}

Answer 5

您可以在 JSON 中添加 if。

const config = [
...(page ? [
     {
        "name"      : "SiteTitle",
        "bgcolor"   : "",
        "color"     : "",
        "position"  : "TL",
        "text"      : "step1",
        "time"      : 5000
    },
    {
        "name"      : "Jawal",
        "bgcolor"   : "",
        "color"     : "",
        "text"      : "step2",
        "position"  : "BL",
        "time"      : 5000
    }] : [{
        "name"      : "Password",
        "bgcolor"   : "",
        "color"     : "",
        "text"      : "step3",
        "position"  : "TL",
        "time"      : 5000
    }]),
];

如何在JSON中使用if语句？

5 个答案: