jQuery筛选数组之grep、each、inArray、map的用法及遍历json对象

jquery grep()筛选遍历数组

$().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]);
 }
 }
);

jquery each()筛选遍历数组

$().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);
 }
 );
 }
);

jquery inArray()筛选遍历数组

$().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
 }
);

jquery map()筛选遍历数组

$().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]);
 }
 }
);

jquery遍历解析json对象1：

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

jquery遍历解析json对象2

//有如下 json对象：
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;
}