请问json如何追加内容，并且修改，和删除操作。急~ 将json格式的数据输出到html页面，急急急~
EXTJS \u4e2djson\u4f1a\u628a\u5b57\u7b26\u4e32\u4e2d\u7684\u591a\u4e2a\u7a7a\u683c\u53d8\u4e3a\u4e00\u4e2a\uff0c\u600e\u6837\u8bbe\u7f6e\u624d\u80fd\u8ba9\u5b83\u4e0d\u6539\u53d8\u5b57\u7b26\u4e32\u4e2d\u7a7a\u683c\u7684\u4e2a\u6570\uff1f\u6025~~~json\u5e94\u8be5\u4e0d\u4f1a\u5904\u7406\u7a7a\u683c\u7684\uff0chtml\u624d\u4f1a\u5c06\u591a\u4e2a\u7a7a\u683c\u5904\u7406\u6210\u4e00\u4e2a\u7a7a\u683c\u3002
\u8bf7\u8bd5\u7740\u5728\u8f93\u51fa\u7684\u5185\u5bb9\u5916\u9762\u52a0\u4e0a
\u524d\u53f0\u5728js\u904d\u5386\u4e3e\u4e2a\u4f8b\u5b50
$.get('url',function(josn){ for(json.data in arr){ alert(arr.expect); }});
json追加内容并且修改和删除操作示例：
1、增加：
myObj.user='我是新增的用户-小明';
x +="<h1>增加后的数据</h1>"forin();
2、修改：
myObj.name= "我的网站";
x +="<h1>修改后的数据</h1>"forin();
3、删除：
delete myObj.sites;
x +="<h1>删除后的数据</h1>"forin();
扩展资料
JS动态动态创建JSON数据字符串，并且可以删除添加修改
<script type="text/javascript">
//添加或者修改json数据
function setJson(jsonStr,name,value)
{
if(!jsonStr)jsonStr="{}";
var jsonObj = JSON.parse(jsonStr);
jsonObj[name] = value;
return JSON.stringify(jsonObj)
}
//删除数据
function deleteJson(jsonStr,name)
{
if(!jsonStr)return null;
var jsonObj = JSON.parse(jsonStr);
delete jsonObj[name];
return JSON.stringify(jsonObj)
}
//生成测试
var myjsonStr = setJson(null,"name","aaa");
alert(myjsonStr);
//添加测试
myjsonStr = setJson(myjsonStr,"age",18);
alert(myjsonStr);
//修改测试
myjsonStr = setJson(myjsonStr,"age",20);
alert(myjsonStr);
//删除测试
myjsonStr = deleteJson(myjsonStr,"age");
alert(myjsonStr);
</script>
使用方法
var str = '[{"name":"aa","age":"23"},{"name":"bb","age":"24"},{"name":"cc","age":"25"}]';
var array=JSON.parse(str);
array.push({"name":"dd","age":"25"});
//修改
var obj=array.firstOrDefault(
function(x){
return x.name=='bb';
}
);
obj.age=25;
//删除
array.delete(
function(x){
return x.name=='cc';
}
);
//转为json字符串
str=JSON.stringify(array);js代码文件js.js
//----------
Array.prototype.firstOrDefault = function (predicate) {
var first = null;
if (typeof predicate == "undefined") {
if (this.length > 0)
first = this[0];
} else if (typeof predicate == "function") {
for (var i = 0; i < this.length; i++) {
if (predicate(this[i])) {
first = this[i];
break;
}
}
} else {
throw new Error("predicate 类型必须为function");
}
return first;
};
Array.prototype.delete = function (predicate) {
if (typeof predicate == "function") {
var obj = this.firstOrDefault(predicate);
if (obj) {
delete obj;
}
} else {
throw new Error("predicate 类型必须为function");
}
};
额，这个你先获取json 然后，遍历啊
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