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var data = [{"id":"1","name":"a"},{"id":"2","name":"b"}];
alert(eval(data).length);
var data = {
"code": 1,
"message": "信息",
"persons": [
{
"id": 1,
"name": "张三",
"sex": "女 "
},
{
"id": 2,
"name": "李四",
"sex": "女 "
}
{
"id": 3,
"name": "王五",
"sex": "男 "
}
],
"mather": {
"mathername":"刘一",
"matherage":"50",
}
}
var persons = data.persons;
alert(eval(data).length);