为什么程序不读取文件json？答案

【问题标题】：why file json isn't read by the program?为什么程序不读取文件json？
【发布时间】：2013-05-18 20:12:40
【问题描述】：

嗨，我不明白为什么如果我在变量中写入 json 是正确的：

var theUI  = {
"nodes":{"progetto 1":{"color":"red", "shape":"dot", "alpha":1},
"demos":{"color":"#b2b19d", shape:"dot", "alpha":1},
"halfviz":{"color":"#a7af00", "alpha":0, "link":""},
"atlas":{"color":"#a7af00", "alpha":0, "link":""},
"echolalia":{"color":"#a7af00", "alpha":0, "link":""},
"docs":{"color":"#b2b19d", "shape":"dot", "alpha":1},
"reference":{"color":"#922E00", "alpha":0, "link":""},
"introduction":{"color":"#922E00", "alpha":0, "link":""},
"code":{"color":"#b2b19d", "shape":"dot", "alpha":1},
"github":{"color":"orange", "alpha":0, "link":""},
".zip":{"color":"orange", "alpha":0, "link":""},
".tar.gz":{"color":"orange", "alpha":0, "link":""}
},
"edges":{
"progetto 1":{
"demos":{"length":.8},
"docs":{"length":.8},
"code":{"length":.8}
},
"demos":{"halfviz":{},
"atlas":{},
"echolalia":{}
},
"docs":{"reference":{},
"introduction":{}
},
"code":{".zip":{},
".tar.gz":{},
"github":{}
}
}
}
var sys = arbor.ParticleSystem()
sys.parameters({stiffness:900, repulsion:2000, gravity:true, dt:0.015})
sys.renderer = Renderer("#sitemap")
sys.graft(theUI)
var nav = Nav("#nav")
$(sys.renderer).bind('navigate', nav.navigate)
$(nav).bind('mode', sys.renderer.switchMode)
nav.init()
})

如果我从文件 json 中提供数据，程序将无法运行：

var theUI  = $.getJSON("data.json")


var sys = arbor.ParticleSystem()
sys.parameters({stiffness:900, repulsion:2000, gravity:true, dt:0.015})
sys.renderer = Renderer("#sitemap")
sys.graft(theUI)
var nav = Nav("#nav")
$(sys.renderer).bind('navigate', nav.navigate)
$(nav).bind('mode', sys.renderer.switchMode)
nav.init()
})

它会获取并读取 json，但程序不起作用。

文件data.json是这样的：

{
"nodes":{"progetto 1":{"color":"red", "shape":"dot", "alpha":1},
"demos":{"color":"#b2b19d", shape:"dot", "alpha":1},
"halfviz":{"color":"#a7af00", "alpha":0, "link":""},
"atlas":{"color":"#a7af00", "alpha":0, "link":""},
"echolalia":{"color":"#a7af00", "alpha":0, "link":""},
"docs":{"color":"#b2b19d", "shape":"dot", "alpha":1},
"reference":{"color":"#922E00", "alpha":0, "link":""},
"introduction":{"color":"#922E00", "alpha":0, "link":""},
"code":{"color":"#b2b19d", "shape":"dot", "alpha":1},
"github":{"color":"orange", "alpha":0, "link":""},
".zip":{"color":"orange", "alpha":0, "link":""},
".tar.gz":{"color":"orange", "alpha":0, "link":""}
},
"edges":{
"progetto 1":{
"demos":{"length":.8},
"docs":{"length":.8},
"code":{"length":.8}
},
"demos":{"halfviz":{},
"atlas":{},
"echolalia":{}
},
"docs":{"reference":{},
"introduction":{}
},
"code":{".zip":{},
".tar.gz":{},
"github":{}
}
}
}

【问题讨论】：

标签： jquery json arbor.js

【解决方案1】：

因为您的 JSON 中有语法错误：

SyntaxError: test.json: Unexpected token s

第二行：

"demos":{"color":"#b2b19d", shape:"dot", "alpha":1},

shape 应该被引用。

请记住，在 JSON 中，所有键和字符串值都必须用双引号引起来，才能获得有效的 JSON

编辑：我现在感觉自己像个编译器。 :D

因为你有下一个语法错误：

SyntaxError: test.json: Unexpected token .

这两次是在以下几行中：

"demos":{"length":.8},
"docs":{"length":.8},
"code":{"length":.8}

.8 不是有效的 JSON 值。使用0.8

现在应该就是这样了，你可以开始了。

【讨论】：

好的，非常感谢，我还没有看到，但更不幸的是，结果是一样的......

【解决方案2】：

你需要像这样使用回调函数 -

$.getJSON("data.json", function (theUI) {
    var sys = arbor.ParticleSystem();
    sys.parameters({
        stiffness: 900,
        repulsion: 2000,
        gravity: true,
        dt: 0.015
    });
    sys.renderer = Renderer("#sitemap");
    sys.graft(theUI);
    var nav = Nav("#nav");
    $(sys.renderer).bind('navigate', nav.navigate);
    $(nav).bind('mode', sys.renderer.switchMode);
    nav.init();
});

还有，

jsonlint 测试：http://jsonlint.com/

Parse error on line 9:
...2b19d",            shape: "dot",      
----------------------^
Expecting 'STRING'

【讨论】：