karabiner.json

{
  "title": "Key settings for keyboard.",
  "rules": [
      {
          "description":"Change held_down caps_lock to Fn, alone key press to Escape",
          "manipulators":[
              {
                  "type":"basic",
                  "from": {
                      "key_code": "caps_lock",
                      "modifiers":{
                          "optional":[
                              "any"
                          ]
                      }
                          
                  },
                  "to_if_held_down":[
                      {
                          "key_code":"fn"
                      }
                  ],
                  "to_if_alone":[
                      {
                          "key_code":"escape"
                      }
                  ]
              }
          ]
      },
      {
          "description": "Change Fn-U to PageUp, Fn-D to PageDown",
          "manipulators": [
              {
                  "type": "basic",

                  "from": {
                    "key_code": "u",
                    "modifiers": {
                      "mandatory": ["fn"],
                      "optional":[
                          "any"
                      ]
                    }
                  },

                  "to": [
                      {
                        "key_code": "page_up"
                      }
                  ]
              },
            {
                  "type": "basic",

                  "from": {
                    "key_code": "d",
                    "modifiers": {
                      "mandatory": ["fn"],
                      "optional":[
                          "any"
                      ]
                    }
                  },
                  "to": [
                      {
                        "key_code": "page_down"
                      }
                  ]
            }
          ]
      },
      {
        "description": "Fn-w to Wechat, Fn-c to Chrome, Fn-v to VSCode",
        "manipulators": [
            {
              "type": "basic",

              "from": {
                "key_code": "w",
                "modifiers": {
                  "mandatory": ["fn"],
                  "optional":[
                      "any"
                  ]
                }
              },

              "to": [
                {
                  "shell_command": "open -b com.tencent.xinWeChat"
                }
              ]
          },
          {
              "type": "basic",

              "from": {
                "key_code": "c",
                "modifiers": {
                  "mandatory": ["fn"],
                  "optional":[
                      "any"
                  ]
                }
              },

              "to": [
                {
                  "shell_command": "open -b com.google.Chrome"
                }
              ]
          },
          {
              "type": "basic",

              "from": {
                "key_code": "v",
                "modifiers": {
                  "mandatory": ["fn"],
                  "optional":[
                      "any"
                  ]
                }
              },

              "to": [
                {
                  "shell_command": "open -b com.microsoft.VSCode"
                }
              ]
          }
        ]
      },
      {
        "description": "Change Fn-E to ESC",
        "manipulators": [
            {
              "type": "basic",

              "from": {
                "key_code": "e",
                "modifiers": {
                  "mandatory": ["fn"],
                  "optional":[
                      "any"
                  ]
                }
              },

              "to": [
                {
                  "key_code": "escape"
                }
              ]
          }
        ]
      },
      {
        "description": "Change Fn-HJKL to Arrow left,down,up,right",
        "manipulators": [
          {
              "type": "basic",

              "from": {
                "key_code": "h",
                "modifiers": {
                  "mandatory": ["fn"],
                  "optional":[
                      "any"
                  ]
                }
              },

              "to": [
                {
                  "key_code": "left_arrow"
                }
              ]
          },
          {
              "type": "basic",

              "from": {
                "key_code": "j",
                "modifiers": {
                  "mandatory": ["fn"],
                  "optional":[
                      "any"
                  ]
                }
              },

              "to": [
                {
                  "key_code": "down_arrow"
                }
              ]
          },
          {
              "type": "basic",

              "from": {
                "key_code": "k",
                "modifiers": {
                  "mandatory": ["fn"],
                  "optional":[
                      "any"
                  ]
                }
              },

              "to": [
                {
                  "key_code": "up_arrow"
                }
              ]
          },
          {
              "type": "basic",

              "from": {
                "key_code": "l",
                "modifiers": {
                  "mandatory": ["fn"],
                  "optional":[
                      "any"
                  ]
                }
              },

              "to": [
                {
                  "key_code": "right_arrow"
                }
              ]
          }
        ]
      }
  ]
}