feat: 为computed属性增加getter和setter

src/runtime/data.js

@@ -177,6 +177,17 @@ function immutableSet(source, exprPaths, pathsStart, pathsLen, value, data) {
     return result;
 }
 
+/**
+ * 检查是否是在更新computed的数据
+ *
+ * @param {string} prop 数据项路径
+ * @param {*} value 数据值
+ * @return {boolean} 是否执行了computed的setter
+ */
+ Data.prototype._updateComputed = function (prop, value) {
+    return this.__computed && this.__computed[prop] && (this.__computed[prop](value) || 1);
+};
+
 /**
  * 设置数据项
  *
@@ -210,6 +221,11 @@ Data.prototype.set = function (expr, value, option) {
     };
 
     var prop = expr.paths[0].value;
+
+    if (!option.__forceComputed && this._updateComputed(prop, value)) {
+        return;
+    }
+
     this.raw[prop] = immutableSet(this.raw[prop], expr.paths, 1, expr.paths.length, value, this);
 
     this.fire({

src/view/component.js

@@ -491,7 +491,7 @@ Component.prototype._calcComputed = function (computedExpr) {
 
     var me = this;
     try {
-        var result = this.computed[computedExpr].call({
+        var result = (this.computed[computedExpr].get || this.computed[computedExpr]).call({
             data: {
                 get: function (expr) {
                     // #[begin] error
@@ -516,11 +516,19 @@ Component.prototype._calcComputed = function (computedExpr) {
                 }
             }
         });
-        this.data.set(computedExpr, result);
+        this.data.set(computedExpr, result, {
+            // 添加一个flag，避免死循环
+            __forceComputed: 1
+        });
     }
     catch (e) {
         handleError(e, this, 'computed:' + computedExpr);
     }
+    // 如果computed是对象且存在set方法
+    if (this.computed[computedExpr].set) {
+        this.data.__computed = this.data.__computed || {};
+        this.data.__computed[computedExpr] = bind(this.computed[computedExpr].set, this);
+    }
 };
 
 /**