How to develop WeChat mini programs
This time I will show you how to develop WeChat mini programs and what are the precautions for developing WeChat mini programs. The following is a practical case, let's take a look.
no.1 The background image is not displayed
The WeChat applet allows users to customize the background image, but the path and address of the background image are limited. Previously, it had been Use a relative path to write, and the background image is also displayed in the WeChat developer tools. I mistakenly thought that there was no problem, but when I previewed it, I found that the background image was not displayed on the phone. This is the first pitfall introduced today. The background image is not allowed to be Local pictures.Solution:
First, use the method of converting online pictures to base64 code. The advantage of this method is that the pictures are not stored locally. Or on the server, it takes up less space and is easy to modify. The disadvantage is that the processing effect of small pictures is better. The code for large pictures is quite long. If it is too long, I don’t want to look at it...Second, upload the pictureno.2 Pull-down does not trigger onPullDownRefresh
//下拉事件
onPullDownRefresh: function() {
console.log("好用不?")
wx.showToast({
title: '没事儿别乱拉',
icon: 'success',
duration: 2000
})
},
//上拉事件
onReachBottom: function() {
wx.showToast({
title: '没事儿别乱拽',
icon: 'success',
duration: 2000
})
}"window": {
"enablePullDownRefresh":true //开启下拉功能
}no .3 How to cancel monitoring of gravity sensing API
The WeChat applet does not provide a shake API interface, but it provides a gravity sensing API "wx.onAccelerometerChange(CALLBACK)", we can use this Method to simulate the WeChat shake function, the code is as follows:Page({
onShow: function () {
wx.onAccelerometerChange(function (e) {
console.log(e.x)
console.log(e.y)
console.log(e.z)
if (e.x > 1 && e.y > 1) {
wx.showToast({
title: '摇一摇成功',
icon: 'success',
duration: 2000
})
}
})
},
onHide: function(){
}
})Page({
isShow: false,
onShow: function () {
var that = this;
this.isShow = true;
wx.onAccelerometerChange(function (e) {
if(!that.isShow){
return
}
console.log(e.x)
console.log(e.y)
console.log(e.z)
if (e.x > 1 && e.y > 1) {
wx.showToast({
title: '摇一摇成功',
icon: 'success',
duration: 2000
})
}
})
},
onHide: function(){
this.isShow = false;
}
})Detailed explanation of Vue key modifier processing event steps
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