deepclone 循环引用

专题系列/deepclone之循环引用问题.js

@@ -0,0 +1,16 @@
+function deepClone(obj, map = new Map()) {
+    if(!obj || typeof obj !== 'object') return obj
+    if(map.get(obj)) {
+        return map.get(obj)
+    }
+    let res = Array.isArray(obj) ? [] : {}
+    map.set(obj, res)
+    let keys = Object.keys(obj)
+    let key, temp
+    for(let i = 0, len = keys.length; i < len; i++) {
+        key = keys[i]
+        temp = obj[key] 
+        res[key] = deepClone(temp, map)
+    }
+    return res
+}