once the default value of the parameter is set, the parameter forms a separate context when the function is declared to initialize. When initialization is complete, the scope disappears. This syntax behavior is not an extension of the function when th...
I have just learned python and encountered some problems about the scope of variables, as follows: the following is not very clear var a = 3 const f = () => { a += 4 console.log(a) } a() 7 f() 7 in js , you can not only access gl...
can you translate days into the number of php accounts? the code is as follows: $( -sharpdemo ).multiDatesPicker({ dateFormat: "d-m-y", }); $("-sharpgetdates").click(function(e){ var days; var selectedDates = $( -...
the problem now is that the pictures uploaded to the background need to be cropped in a specified proportion, such as cropping the uploaded pictures to 4:3 before uploading. Is there a good way to do this? ...
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after I push to a page, I can t click on all the links, and I don t have that style. I don t know if it s the plug-in problem of the swal pop-up box that I used or why, and when I m running it locally, IE10 can t run the project directly in a blan...
you need to generate a shared image, and the mini program code obtained is base64 text. The drawImage of canvas in Mini Program does not support data in base64 format, which is fine on the computer simulator, but not on the real machine. could you tell ...