推送到javascript数组(如果存在)，如果不存在，则先创建它 [英] Push to a javascript array if it exists, if not then create it first

问题描述

此行是否有一条始终有效且不抛出TypeError: Cannot read property 'Whatever' of undefined

Is there a way for this line to always work and not throw TypeError: Cannot read property 'Whatever' of undefined

var MyArray = [];
MyArray[StringVariableName][StringVariableName2].push("whatever");

推荐答案

尝试一下:

var MyArray = [];
MyArray[StringVariableName] = MyArray[StringVariableName] || [];
MyArray[StringVariableName][StringVariableName2] = MyArray[StringVariableName][StringVariableName2] || [];
MyArray[StringVariableName][StringVariableName2].push("whatever");

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