Question

请以示例Select代码

回答我

我想将值添加到数组本地文件JSON（将成员插入JSON）
元素也替换为{J}中的type，name ...等元素（JSON中的更新成员）
删除id="1"和email="amir@site.com"的数字行（在JSON中删除memebr）

JSON文件：report.json

var amir='{"reports":[' +
    '{"id": "1","type": "admin","name": "amir","email": "amir@site.com","password": "123"},' +
    '{"id": "2","type": "member","name": "kevin","email": "ad@ad.com","password": "1234"}]}';

示例select代码，用于检查寄存器admin：

var obj = JSON.parse(amir);
for(c = 0; c <= obj.reports.length - 1; c++) {
    type = obj.reports[c].type.toString();
    if (type == "admin") {
        active = 1;
    }

    if (c == obj.reports.length - 1) {
        if (active == 1)
            alert("Yes");
        else
            alert("No");
    }
}

Answer 1

至于将操作JSON的结果保存到磁盘，必须在后端完成，或者您可以打开一个窗口，将该文件作为内容，将MIME类型设置为json，这可能会提示用户将其保存到计算机，具体取决于他们的浏览器设置。请参阅http://www.w3schools.com/jsref/met_doc_open.asp。

请参阅下文，了解JSON对象的操作。

var amir='{"reports":[' +
    '{"id": "1","type": "admin","name": "amir","email": "amir@site.com","password": "123"},' +
    '{"id": "2","type": "member","name": "kevin","email": "ad@ad.com","password": "1234"}]}';

var obj = JSON.parse(amir);

document.getElementById("before").innerHTML = JSON.stringify(obj);
console.log("Before", JSON.parse(JSON.stringify(obj))); // objects use pointers, clone it to see the value at this point


// Add a new member into the array (example, using made up values)
obj.reports.push({
  "id": ""+obj.reports.length + 1,
  "type": "member",
  "name": "Joe",
  "email": "asdf@gmail.com",
  "password": "ajdj12oi42"
});

document.getElementById("during").innerHTML = JSON.stringify(obj);
console.log("During", JSON.parse(JSON.stringify(obj))); // objects use pointers, clone it to see the value at this point

// When deleting items, it is often easier to start high, and end low
for(var c = obj.reports.length - 1; c >= 0; c--) {
  // Delete member in JSON where id == 1 and email == amir@site.com
  if(obj.reports[c].id == "1" && obj.reports[c].email == "amir@site.com") {
    obj.reports.splice(c, 1);
  } else {
    // Add values into the objects (example, using random numbers)
    obj.reports[c].newKey = "New Value! " + Math.floor(Math.random() * 100);
  }
}

document.getElementById("after").innerHTML = JSON.stringify(obj);
console.log("After", JSON.parse(JSON.stringify(obj))); // objects use pointers, clone it to see the value at this point

<h1>Before</h1>
<div id="before"></div>

<h1>During</h1>
<div id="during"></div>

<h1>After</h1>
<div id="after"></div>

如何使用JavaScript编辑本地JSON文件

1 个答案: