Javascript-jquery get value, iOS and Android get value issues

jquery Gets the value that iOS can't get, while Android can

function ajaxform(){var id=$(".main_box ul li:last-child").find('.delete_btn').attr('field');alert(id);alert(isadmin);$.ajax({    type:'POST',    url:"{:U('App/Friends/ajaxform')}",    data:{"openid":openid,"id":id},    dataType:"json",    global:false,    success:function(data){           $.each(data[1],function(e,a){        isblack=a;      });          }});

}

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jquery Gets the value that iOS can't get, while Android can

function ajaxform(){var id=$(".main_box ul li:last-child").find('.delete_btn').attr('field');alert(id);alert(isadmin);$.ajax({    type:'POST',    url:"{:U('App/Friends/ajaxform')}",    data:{"openid":openid,"id":id},    dataType:"json",    global:false,    success:function(data){           $.each(data[1],function(e,a){        isblack=a;      });          }});

}

You first note the other, the page into only run this line, I just use the 7.2 version of the iphone test, can come out.

var id=$(".main_box ul li:last-child").find('.delete_btn').attr('field');alert(id);

The declaration function is placed in the Ready function.

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