Summary of sample codes for jquery traversal array methods and simple traversal of json objects

jquery grep() filterTraverse the array

$().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() filter and traverse the array

$().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() filters and traverses the array

$().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() filters and traverses the array

$().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]); 
} 
} 
);

js traverses and parses jsonobject 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+&#39;:&#39;+json[i][key]); 
} 
}

js traverses and parses json objects 2

There are the following json objects:
var obj ={"name":"Feng Juan","password":"123456 ","department":"Technical Department","sex":"Female","old":30};
Traversal method:

for(var p in obj){ 
str = str+obj[p]+','; 
return str; 
}

JS simpleLoopTraverse json Array methods.

For example, the jsonstring in the database is like this

var str = '[{"name":"宗2瓜","num":"1","price":"122"},{"name":"宗呱呱","num":"1","price":"100"}]';
var xqo = eval('(' + str + ')');
for(var i in xqo){
　　alert(xqo[i].name);
}

The above is js, and the following is jquery to parse the json string,

var cc = jQuery.parseJSON(data);
alert(cc[0].title);

For looping, it’s the same as above

The above is the detailed content of Summary of sample codes for jquery traversal array methods and simple traversal of json objects. For more information, please follow other related articles on the PHP Chinese website!