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This article mainly introduces the relevant knowledge of "how WeChat Mini Programs modifies the array length". The editor shows you the operation process through an actual case. The operation method is simple, fast and practical. I hope this article "how WeChat Mini Programs modifies the array length" can help you solve the problem.

When you re-modify the length of the array in WeChat Mini Programs, there is a problem with using setData: you will not be able to update the data in a timely manner. After trying to use data to forcibly update the data, you can use setData to process the data where you need to assign values. You can use it, but you don't know if it is the best solution. Reference exampl

SetarrayData (data) {let array = this.data.list;// forced update array.length = = 0 & (this.data.list = new Array (+ data.num)); / / copy data let copyArray = [... this.data.pictureList]; / / Array data processing copyArray.splice (num1, num2,... data.list) / / Update to view layer this.setData ({list: copyArray,})

PS: a pit with a length of 0 in WeChat Mini Programs array

When I was writing the program the other day, both the Appdata printed in console.log on the js page and the Appdata I saw in the debug window showed that my result array was 20 in length, but it was always 0 in the xml page through {{result.length}}. After searching for bug for a long time, I finally found that when I modified the result array in js, I used this.data.result.push () instead of the officially suggested this.setData () function. Causes an inconsistency in the result array.

This is the end of the introduction about "how WeChat Mini Programs modifies the length of the array". Thank you for your reading. If you want to know more about the industry, you can follow the industry information channel. The editor will update different knowledge points for you every day.

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