JS获得JSON数组其中的一列方法。 js 获取 json中的数组的一个值
js\u904d\u5386\u67d0\u4e00\u5217json\u6570\u636e\u548c\u7528JS\u539f\u751f\u7684\u65b9\u6cd5\u5373\u53ef\uff0c\u4e0d\u8fc7\u6ca1\u5728JSON\u4e0a\u770b\u5230\u6570\u503c\u554a\uff0c\u6211\u5e2e\u4f60\u53d6\u5230\u4e86\u6570\u7ec4\uff0c\u5269\u4e0b\u7684\u81ea\u5df1\u64cd\u4f5c\u4e0b\u5c31\u53ef\u4ee5\u4e86\u3002
Documentvar JosnInfo = {"sites": [{"title": "\u6279\u6b21\u6570\u91cf","Field": "pcsl","ReadOnly": "readonly='readonly'","Hidetd": "true","tdEvent": " onclick='openPC(this)'","tdClass": "tdspbh","txtAlign": ""},{"title": "\u7f16\u53f7","Field": "spbh","ReadOnly": "readonly='readonly'","Hidetd": "false","tdEvent": " ","tdClass": "tdspbh","txtAlign": ""},{"title": "\u540d\u79f0","Field": "spmc","ReadOnly": "readonly='readonly'","Hidetd": "false","tdEvent": " onkeydown='SXZY(this)' ","tdClass": "tdspmc","txtAlign": ""},{"title": "\u89c4\u683c","Field": "ggxh","ReadOnly": "readonly='readonly'","Hidetd": "false","tdEvent": " onkeydown='SXZY(this)' ","tdClass": "tdggxh","txtAlign": ""},{"title": "\u4ea7\u5730","Field": "spcd","ReadOnly": "readonly='readonly'","Hidetd": "false","tdEvent": " onkeydown='SXZY(this)' ","tdClass": "tdcd","txtAlign": ""},{"title": "\u5355\u4f4d","Field": "spdw","ReadOnly": "readonly='readonly'","Hidetd": "false","tdEvent": " onkeydown='SXZY(this)' ","tdClass": "tddw","txtAlign": "text-align:center;"},{"title": "\u6570\u91cf","Field": "spsl","ReadOnly": "","Hidetd": "false","tdEvent": " onpaste='return false' onkeydown='return check(event)' onkeydown='SXZY(this)' onblur='sl_onblur(this)' ","tdClass": "tdsl","txtAlign": "text-align:right;"},{"title": "\u5355\u4ef7","Field": "spdj","ReadOnly": "","Hidetd": "false","tdEvent": " onpaste='return false' onkeydown='return check(event)' onkeydown='SXZY(this)' onblur='dj_onblur(this)'","tdClass": "tddj","txtAlign": "text-align:right;"}]};JosnInfo = JSON.stringify(JosnInfo);var text = JSON.parse(JosnInfo);console.log(text.sites);
\u4f60json\u4e0d\u5bf9\u554a\uff0ca\u7684\u503c\u662f\u5b57\u7b26\u4e32\uff0c\u4e0d\u662f\u6570\u7ec4\uff0c\u5e94\u8be5\u662f
var json={
a:["aaaaa","bbbbb","ccccc"],
b:["11111","22222","33333"]
};
\u628a\u5355\u5f15\u53f7\u53bb\u6389\u624d\u662f\u6570\u7ec4\u5462\u3002
\u7136\u540e\u5c31\u53ef\u4ee5\u7528json.a[1]\u8bbf\u95eebbbbb\u4e86
JavaScript没有函数可以直接获取数组的某一列。
这个你只能用for语句循环遍历了。
要把数组的长度缓存到一个变量（len）里面，这样能更好的提升代码性能。
var arr = [
{
id: 1,
riqi: '2017-11-13'
},
{
id: 2,
riqi: '2017-11-14'
},
{
id: 3,
riqi: '2017-11-15'
},
],
// 缓存数组长度，进一步提升代码性能
len = arr.length,
result = [];
for (var i = 0; i < len; i++) {
result[i] = arr[i]['riqi']
};
console.log(result);
首先js 里面没有相应的方法，必须自己去实现
一、方法实现 getParamValues
// 原始数据
var arr = [{
name: 'w1',
age: 101
}, {
name: 'w2',
age: 102
}, {
name: 'w3',
age: 103
}]
// 实现方法
// @param name { String } 需要返回的属性名
// @param arr { Array } 原始数据
// @return ret { Array } 返回值
function getParamValues(name, arr) {
var ret = []
for (var i = 0, len = arr.length; i < len; i++) {
ret.push(arr[i][name])
}
return ret
}
var ret = getParamValues('age', arr)
console.log(ret)
二、运行结果
绛旓細JavaScript娌℃湁鍑芥暟鍙互鐩存帴鑾峰彇鏁扮粍鐨勬煇涓鍒銆傝繖涓綘鍙兘鐢╢or璇彞寰幆閬嶅巻浜嗐傝鎶婃暟缁勭殑闀垮害缂撳瓨鍒颁竴涓彉閲忥紙len锛夐噷闈紝杩欐牱鑳芥洿濂界殑鎻愬崌浠ｇ爜鎬ц兘銆倂ar arr = [ { id: 1, riqi: '2017-11-13' }, { id: 2, riqi: '2017-11-14' }, { id: 3, r...
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绛旓細缁欑殑date鏄釜json瀛楃涓诧紝鍙互鍏堣浆鎴恓s瀵硅薄锛歭et date_obj=JSON.parse(date);姝ゅ悗date_obj灏辨槸涓涓璞★紝鍙栧埌杩欎釜鏁扮粍锛歭et arr=date_obj.numbers;鐒跺悗鐢ㄧ储寮曡闂產rr灏辫兘鍙栧埌浠绘剰涓涓厓绱犮傜患鍚涓 JSON.parse(date).numbers[x],x涓烘兂鍙栫殑鍏冪礌绱㈠紩锛屼粠0寮濮 ...
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绛旓細//json:鐩爣ID缁撴灉闆 function GetSubJson(jsonData, destID, json) { for (var i = 0; i < jsonData.length; i++) { if (jsonData[i].id == destID)json.push(jsonData[i]);else { if (jsonData[i].hasOwnProperty("children")) { GetSubJson(jsonData[i].children, destID,...
