Question

嗨，我有一个这样的UI模板节点

[{"id":"a5c1aeec.acf41","type":"ui_template","z":"317f5671.321bea","group":"7390bf6e.e7d18","name":"alert","order":0,"width":"","height":"","format":"<meta http-equiv=\"cache-control\" content=\"no-cache\" />\n<meta http-equiv=\"Pragma\" content=\"no-cache\" />\n<meta http-equiv=\"Expires\" content=\"-1\" />\n\n<div></div>\n<script>\n\n(function(scope) {\n    scope.$watch('msg', function(msg) {\n                alert(msg.payload);\n                 return msg;\n    });\n  \n})(scope);\n  \n</script>\n\n","storeOutMessages":false,"fwdInMessages":false,"templateScope":"local","x":930,"y":540,"wires":[[]]},{"id":"ea160087.f05fd","type":"inject","z":"317f5671.321bea","name":"","topic":"","payload":"hello","payloadType":"str","repeat":"","crontab":"","once":false,"onceDelay":0.1,"x":704,"y":539,"wires":[["a5c1aeec.acf41"]]},{"id":"7390bf6e.e7d18","type":"ui_group","z":"","name":"info","tab":"3b15c8d0.06c048","order":5,"disp":false,"width":"9","collapse":false},{"id":"3b15c8d0.06c048","type":"ui_tab","z":"","name":"config","icon":"settings","order":4}]

当我重新加载页面时，虽然没有传递“ msg.payload”，但它以以前的值执行。谁能帮助我如何清除缓存或重新加载时不显示任何警报。

Answer 1

您可以检查变量，如果没有这样设置，则跳过警报：

(function(scope) {
scope.$watch('msg', function(msg) {
            if(typeof(window.lastAlert)=="undefined"){
                window.lastAlert = msg;
            }else{
                alert(msg.payload);
            }
            return msg;
});

这对我来说使用chrome很有用。更新流程后，您可能必须清除浏览器缓存。（Chrome浏览器中为Ctrl + F5）

[{"id":"14e8dc7a.390aa4","type":"ui_template","z":"98c20df4.95abc","group":"d1f187ec.103688","name":"alert","order":0,"width":"","height":"","format":"<meta http-equiv=\"cache-control\" content=\"no-cache\" />\n<meta http-equiv=\"Pragma\" content=\"no-cache\" />\n<meta http-equiv=\"Expires\" content=\"-1\" />\n\n<div></div>\n<script>\n\n(function(scope) {\n    scope.$watch('msg', function(msg) {\n                if(typeof(window.lastAlert)==\"undefined\"){\n                    window.lastAlert = msg;\n                }else{\n                    alert(msg.payload);\n                }\n                return msg;\n    });\n})(scope);\n\n</script>\n\n","storeOutMessages":false,"fwdInMessages":false,"templateScope":"local","x":690,"y":360,"wires":[[]]},{"id":"c59c7cc4.0593e","type":"inject","z":"98c20df4.95abc","name":"","topic":"","payload":"hello","payloadType":"str","repeat":"","crontab":"","once":false,"onceDelay":0.1,"x":510,"y":360,"wires":[["14e8dc7a.390aa4"]]},{"id":"d1f187ec.103688","type":"ui_group","z":"","name":"info","tab":"aa1700c2.78e64","order":5,"disp":false,"width":"9","collapse":false},{"id":"aa1700c2.78e64","type":"ui_tab","z":"","name":"config","icon":"settings","order":4}]

节点Red UI模板如何清除缓存

1 个答案: