合并对象
function objectMerge(target, source) {
if (typeof target !=='object') {
target = {}
}
if (Array.isArray(source)) {
return source.slice()
}
Object.keys(source).forEach(property => {
const sourceProperty = source[property];
if (typeof sourceProperty ==='object') {
target[property] =objectMerge(target[property], sourceProperty)
}else {
target[property] = sourceProperty
}
})
return target
}
