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源码解读不解的地方 #5

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giserman001 opened this issue Apr 3, 2019 · 1 comment

giserman001 commented Apr 3, 2019

/**

获取 elements 的最后一个 index （用于决定 this.props.children 的渲染）
@param {Boolean} dynamic - 是否为动态表单
@param {Array} elements
*/
function getLastIndex(dynamic = false, elements) {
if (!dynamic) return elements.length - 1
const els = elements.filter(v => !!v)
return els.length - 1
}

请问在dynamic == true时filter有何意义？

Owner

alvin0216 commented Apr 3, 2019

动态表单里 demo 里有把其中的 meta.elements 设为 null ，elements.filter(v => !!v) 是过滤 null 计算 index
详见 example/dynamicForm.jsx ，应该有更好的方法~~

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