Question

我想将i设置为来自json标准的第一项的0，例如。如果标准是绿色，在这种情况下，我将从3开始...如果标准=蓝色它将从2开始......我需要将其设置为从0或1开始是否是..还如何计算总数标准，例如。绿色总数是2，蓝色= 1，红色= 2 ......提前感谢！

var myBox_html ="";
var i = 0;

function createDiv(1x,2x,3x) {
    A = '<something>'+1x;
    B = '<something>'+2x;
    C = '<something>'+3x;

    myBox_html += '<something-more>'+A+B+C;
}

criteria // is a parameter from url, in this case means green

get_it = function(doc) {
    var jsonData = eval('(' + doc + ')');        
    for (var i=0; i<jsonvar.name.length; i++) {
        var 1x = jsonvar.name[i].1;
        var 2x = jsonvar.name[i].2;
        var 3x = jsonvar.name[i].3;

        if (1x == criteria){                                                    
            var Div = createDiv(1x,2x,3x);     
        } else {null}
    }   

    document.getElementById("myBox").innerHTML = myBox_html;
}          
get_it();

json应该是这样的：

var jsonvar = {"name":[{"1":"red","2":"round","3":"fruit"},{"1":"red","2":"squared","3":"box"},{"1":"blue","2":"squared","3":"box"},{"1":"green","2":"squared","3":"box"},{"1":"green","2":"pear","3":"fruit"}]};

Answer 1

考虑几种解决方案：

1：在服务器端生成标准分组的JSON响应。 E.g。

var jsonvar = '{"name":{
  "red": [{"1":"red","2":"round","3":"fruit"}, {"1":"red","2":"squared","3":"box"}],
  "blue": [{"1":"blue","2":"squared","3":"box"}],
  "green":[{"1":"green","2":"squared","3":"box"}, {"1":"green","2":"pear","3":"fruit"}]}}';

2：将JSON数组转换为上面定义的条件分组格式。以下是此类分组的示例例程：

function group_elements (arr) {
    var result = {};
    for (var i=0; i < arr.length; i++) {
        if (!result[arr[i][1]]) {
            result[arr[i][1]] = [];
        }
        result[arr[i][1]].push(arr[i]);
     }
     return result;
}

两种解决方案都允许您仅迭代过滤的记录并计算组的长度。

如何从json标准将i设置为0

1 个答案: