Downgrade module

Weex downgrade to web module. Version should be semver format.

install

install from npm command: npm install @weex-project/downgrade --save

sample

``js
import Downgrade from '@weex-project/downgrade'

// force downgrade
Downgrade.force()

/*
check condition. When match anyone condition will return downgrade is true. return format as below:
{
isDowngrade: true,
errorType: 1,
code: 1000,
errorMessage: 'XXXXXXXX'
}
*/
Downgrade.check({
ios: {
osVersion: '>1.0',
appVersion: '>1.0.0',
weexVersion: '>1',
deviceModel: ['iPhone5,1']
},
android: {
osVersion: '>1.0',
appVersion: '>1.0.0',
weexVersion: '>1',
deviceModel: ['G-2PW2100']
}
})

// check condition with multiple app. The MY_APP_A is WXEnvironment's appName param.
Downgrade.check({
ios: {
osVersion: '>1.0',
appVersion: {
MY_APP_A: '>1.0.0',
MY_APP_B: '>2.0.0'
},
weexVersion: '>1',
deviceModel: ['iPhone5,1']
},
android: {
osVersion: '>1.0',
appVersion: {
MY_APP_A: '>1.0.0',
MY_APP_C: '>3.0.0'
},
weexVersion: '>1',
deviceModel: ['G-2PW2100']
}
})

// When match condition will auto downgrade to web
Downgrade.condition({
ios: {
osVersion: '>1.0',
appVersion: '>1.0.0',
weexVersion: '>1',
deviceModel: ['iPhone5,1']
},
android: {
osVersion: '>1.0',
appVersion: '>1.0.0',
weexVersion: '>1',
deviceModel: ['G-2PW2100']
}
})

// When condition with multiple app. The MY_APP_A is WXEnvironment's appName param.
Downgrade.condition({
ios: {
osVersion: '>1.0',
appVersion: {
MY_APP_A: '>1.0.0',
MY_APP_B: '>2.0.0'
},
weexVersion: '>1',
deviceModel: ['iPhone5,1']
},
android: {
osVersion: '>1.0',
appVersion: {
MY_APP_A: '>1.0.0',
MY_APP_C: '>3.0.0'
},
weexVersion: '>1',
deviceModel: ['G-2PW2100']
}
})
``