operations.md

operations | set操作说明

Db.set in node-realtime-db-client take 3 params, path,value and options, options.operation by default is set, if options is a string, it will be used as options.operation

node-realtime-db-client 中的 Db.set 需要3个参数, path,value 和 options, options.operation 默认为 set, 如果 options 是字符串则视作 options.operation

set | 强制更新

replace server value with new one | 替换服务端的值

db.set('path.to.value',newValue)

incr | 增长

increase server value with value passed in, do nothing if server value is not number or undefined

以传入值增长服务端对应的值，如果不是number或undefined则不做任何操作

db.set('path.to.value', 1, Db.operations.incr)

decr | 减少

decrease server value with value passed in, do nothing if server value is not number or undefined

以传入值减少服务端对应的值，如果不是number或undefined则不做任何操作

db.set('path.to.value', 10, Db.operations.decr)

push

push one element into server array end, do nothing if server value is not array or undefined

将传入值插入到数组尾部，如果不是array或undefined则不做任何操作

db.set('path.to.array', 10, Db.operations.push)

unshift

unshift one element into server array begin, do nothing if server value is not array or undefined

将传入值插入到数组头部，如果不是array或undefined则不做任何操作

db.set('path.to.array', 10, Db.operations.unshift)

splice

excute splice on server value, the value passed in should be an array and will be passed to splice, do nothing if server value is not array or undefined

在服务端值上执行splice操作，传入的数组中元素依次作为splice的参数，如果不是array或undefined则不做任何操作

db.get('path.to.array') is [1,2,3,4,5]

db.set('path.to.array', [2,1,[6,7]], Db.operations.splice) result to [1,2,3,4,5].splice(2,1,[6,7]) is [1,2,6,7,4,5]