* 将对象数组转换为键值对 eg: [{name:'a',value:1},{name:'b',value:2}] => {a:1,b:2} * @param {Array. } list 要转换的对象数组 * @param {string} propKey 对象中作为键的属性 eg: name * @param {string|boolean} propValue 对象中作为值的属性, 为true时将给对象增加index属性, 为空时将整个对象作为值
(list, propKey, propValue)
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