You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
69 lines
2.0 KiB
69 lines
2.0 KiB
3 years ago
|
import isFunction from './isFunction';
|
||
|
|
import isPlainObject from './isPlainObject';
|
||
|
|
import isArray from './isArray';
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @description: 对象合并，对象拷贝
|
||
|
|
* @param {object} args
|
||
|
|
* @return {object}
|
||
|
|
* @example extend(obj,obj1,obj2...)//浅合并
|
||
|
|
* @example extend(true,obj,obj1,obj2...)//深度合并
|
||
|
|
*/
|
||
|
|
export default function extend(...args) {
|
||
|
|
let options;
|
||
|
|
let name;
|
||
|
|
let src;
|
||
|
|
let copy;
|
||
|
|
let copyIsArray;
|
||
|
|
let clone;
|
||
|
|
let target = args[0] || {};
|
||
|
|
let i = 1;
|
||
|
|
const length = args.length;
|
||
|
|
let deep = false;
|
||
|
|
// Handle a deep copy situation
|
||
|
|
if (typeof target === 'boolean') {
|
||
|
|
deep = target;
|
||
|
|
// Skip the boolean and the target
|
||
|
|
target = args[i] || {};
|
||
|
|
i++;
|
||
|
|
}
|
||
|
|
// Handle case when target is a string or something (possible in deep copy)
|
||
|
|
if (typeof target !== 'object' && !isFunction(target)) {
|
||
|
|
target = {};
|
||
|
|
}
|
||
|
|
for (; i < length; i++) {
|
||
|
|
// Only deal with non-null/undefined values
|
||
|
|
if ((options = args[i]) != null) {
|
||
|
|
// Extend the base object
|
||
|
|
for (name in options) {
|
||
|
|
copy = options[name];
|
||
|
|
// Prevent Object.prototype pollution
|
||
|
|
// Prevent never-ending loop
|
||
|
|
if (name === '__proto__' || target === copy) {
|
||
|
|
continue;
|
||
|
|
}
|
||
|
|
// Recurse if we're merging plain objects or arrays
|
||
|
|
if (deep && copy && (isPlainObject(copy) || (copyIsArray = isArray(copy)))) {
|
||
|
|
src = target[name];
|
||
|
|
// Ensure proper type for the source value
|
||
|
|
if (copyIsArray && !isArray(src)) {
|
||
|
|
clone = [];
|
||
|
|
} else if (!copyIsArray && !isPlainObject(src)) {
|
||
|
|
clone = {};
|
||
|
|
} else {
|
||
|
|
clone = src;
|
||
|
|
}
|
||
|
|
copyIsArray = false;
|
||
|
|
// Never move original objects, clone them
|
||
|
|
target[name] = extend(deep, clone, copy);
|
||
|
|
// Don't bring in undefined values
|
||
|
|
} else if (copy !== undefined) {
|
||
|
|
target[name] = copy;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
// Return the modified object
|
||
|
|
return target;
|
||
|
|
}
|