<script type="text/javascript"> var json4 ={'name':'mv','age':3,'fun':'web前端'}; for(var attr in json4){ //alert(attr); //name age fun //alert(json4[attr]); //mv 3 web前端 } var json5 = { 'url':['ssss','sdf','sdfdf','sdf'],//attr属性格式 'text':['sss','sdfaf','sdfsdf'] } for( var attr in json5 ){ //先了解里面的属性再去遍历 for( var i=0;i<json5[attr].length;i++){ //alert(attr); //alert(json5[attr][i]); } } //var arr =[{},{},{}];*/ /*var str =''; var num = 0; for( var attr in window){ str += num+':'+attr +':'+window[attr]+'<br/>'; num++; } document.body.innerHTML = str;*/ var json5 = { 'url':['ssss','sdf','sdfdf','sdf'],//attr属性格式 'text':['sss','sdfaf','sdfsdf'] }; var arr =['sdf','sdf','sdf']; for(var i in arr){ //alert(attr);//text alert(arr[i])//sdf sdf sdf }//json 不能用for循环 var i=0;i<arr.length;i++ </script>
var employees = [ { "firstName":"John" , "lastName":"Doe" }, { "firstName":"Anna" , "lastName":"Smith" }, { "firstName":"Peter" , "lastName": "Jones" } ]; 访问:alert(employees[1].lastName); 修改:employees[1].firstName = "Tony";