echarts中关于merge的代码

function merge(target, source, overwrite) {
// We should escapse that source is string
// and enter for ... in ...
if (!isObject$1(source) || !isObject$1(target)) {
return overwrite ? clone(source) : target;
}

for (var key in source) {
if (source.hasOwnProperty(key)) {
var targetProp = target[key];
var sourceProp = source[key];

if (isObject$1(sourceProp)
&& isObject$1(targetProp)
&& !isArray(sourceProp)
&& !isArray(targetProp)
&& !isDom(sourceProp)
&& !isDom(targetProp)
&& !isBuiltInObject(sourceProp)
&& !isBuiltInObject(targetProp)
&& !isPrimitive(sourceProp)
&& !isPrimitive(targetProp)
) {
// 如果需要递归覆盖,就递归调用merge
merge(targetProp, sourceProp, overwrite);
}
else if (overwrite || !(key in target)) {
// 否则只处理overwrite为true,或者在目标对象中没有此属性的情况
// NOTE,在 target[key] 不存在的时候也是直接覆盖
target[key] = clone(source[key], true);
}
}
}

return target;
}
posted @ 2018-10-26 14:35  刘浩2561179983  阅读(1314)  评论(0编辑  收藏  举报