jquery对Json的各种遍历方法总结(必看篇)

packJson = {"name":"caibaojian.", "password":"111"}

packJson = [{"name":"caibaojian.", "password":"111"}, {"name":"tony", "password":"111"}];

var jsonStr = '{"name":"caibaojian", "password":"1111"}';

var jsonObj = {"name":"caibaojian.", "password":"1111"};

var jsonObj = eval('(' + jsonStr + ')');

var jsonStr = jsonObj.toJSONString();

<script type='text/javascript' src="/jquery.js"></script>
<script type="text/javascript">
$().ready(
function(){
var array = [1,2,3,4,5,6,7,8,9];
var filterarray = $.grep(array,function(value){
return value > 5;//筛选出大于5的
});
for(var i=0;i<filterarray.length;i++){
alert(filterarray[i]);
}
for (key in filterarray){
alert(filterarray[key]);
}
}
);
</script>

<script type='text/javascript' src="/jquery.js"></script>
<script type="text/javascript">
$().ready(
function(){
var anObject = {one:1,two:2,three:3};//对json数组each
$.each(anObject,function(name,value) {
alert(name);
alert(value);
});
var anArray = ['one','two','three'];
$.each(anArray,function(n,value){
alert(n);
alert(value);
}
);
}
);
</script>

<script type='text/javascript' src="/jquery.js"></script>
<script type="text/javascript">
$().ready(
function(){
var anArray = ['one','two','three'];
var index = $.inArray('two',anArray);
alert(index);//返回该值在数组中的键值，返回1
alert(anArray[index]);//value is two
}
);
</script>

<script type='text/javascript' src="/jquery.js"></script>
<script type="text/javascript">
$().ready(
function(){
var strings = ['0','1','2','3','4','S','6'];
var values = $.map(strings,function(value){
var result = new Number(value);
return isNaN(result) ? null:result;//isNaN:is Not a Number的缩写
}
);
for (key in values) {
alert(values[key]);
}
}
);
</script>

<script>
var json = [{dd:'SB',AA:'东东',re1:123},{:'dd',lk:'1qw'}];
for(var i=0,l=json.length;i<l;i++){
for(var key in json[i]){
alert(key+':'+json[i][key]);
}
}
</script>

packJson = [

{"name":"nikita", "password":"1111"},

{"name":"tony", "password":"2222"}

];

for(var p in packJson){//遍历json数组时，这么写p为索引，0,1

  alert(packJson[p].name + " " + packJson[p].password);

}

for(var i = 0; i < packJson.length; i++){

  alert(packJson[i].name + " " + packJson[i].password);

}

myJson = {"name":"caibaojian", "password":"1111"};

for(var p in myJson){//遍历json对象的每个key/value对,p为key

  alert(p + " " + myJson[p]);

}

var obj ={"name":"冯娟","password":"123456","department":"技术部","sex":"女","old":30};
遍历方法
for(var p in obj){
str = str+obj[p]+',';
return str;
}