解析json字符串 及字符串数组

1、var data1='{"ConnectedDevicesCountEthernet":0,"ConnectedDevicesCountUSB":1,"ConnectedDevicesCountWiFi":0}';

var data2=eval("("+data1+")");
$("#currentNum").text(data2.ConnectedDevicesCountWiFi);

2、devicesData = '[ { "ConnectedDeviceConnectionType": "WiFi", "ConnectedDeviceApplianceType": "Unknown"},\

    { "ConnectedDeviceConnectionType": "WiFi", "ConnectedDeviceApplianceType": "Unknown"}\
    { "ConnectedDeviceConnectionType": "Unknown", "ConnectedDeviceApplianceType": "Other" } ]';
connectedDevicesData = eval("("+devicesData+")");

for (var i=0; i < connectedDevicesData.length; i++) {
if(connectedDevicesData[i].ConnectedDeviceConnectionType!= "WiFi"){

.......

}

}