Question

我有这个带有键值对的json，我想知道在那个json文件中出现了多少次键值对完全匹配

这是jquery代码

$(document).ready(function(){
var data = [{"programmer":"yes","married": "no", "does_java": "no"},{"programmer":"yes","married": "no", "does_java": "no"},{"programmer":"yes","married": "no", "does_java": "yes"},{"programmer":"yes","married": "no", "does_java": "no"},{"programmer":"yes","married": "no", "does_java": "yes"},{"programmer":"yes","married": "no", "does_java": "no"},{"programmer":"yes","married": "no", "does_java": "yes"},{"programmer":"yes","married": "no", "does_java": "no"},{"programmer":"yes","married": "no", "does_java": "no"},{"programmer":"yes","married": "no", "does_java": "no"},{"programmer":"yes","married": "no", "does_java": "no"}];

//get the number of times a key:value pair occurs in json

/**
I am trying to know the number of times a specific key:value pair occurs in this json.
*/
$.each(data,function(k,v){
if(v['does_java'] === 'yes'){
console.log($(data).find(v['does_java'] === 'yes').length);
//expecting 3,but displays 0
}
});
});

键值does_java:yes出现3次，但在我的情况下，它显示为零。我该如何解决此问题？。

Answer 1

试试这个

...

var javaDo = 0;
$.each(data,function(k,v){
    if(v['does_java'] === 'yes'){
        javaDo++;
    }
});

console.log(javaDo);

Answer 2

试试这个，

JsFiddle

 keyarr = []
$.each(data,function(k,v){

if(v['does_java'] === 'yes'){
keyarr.push(v['does_java']);
}
});

    alert(keyarr.length)

获取key：value对出现在json中的次数

2 个答案: