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var data = {"teacher":[
{
"id":"1",
"teachername":"\u6559\u5e08A",
"subject_grade":"{\"subject\":[5],\"grade\":[18,19]}",
"mastername":"\u73ed\u4e3b\u4efbA"
}
]}
var subject_grade = eval('(' + data.teacher[0].subject_grade + ')');
alert(subject_grade.subject);