Question

我正在尝试动态创建React组件。

已翻译的代码

 result =        window._createClass = function () { function defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ("value" in descriptor) descriptor.writable = true; Object.defineProperty(target, descriptor.key, descriptor); } } return function (Constructor, protoProps, staticProps) { if (protoProps) defineProperties(Constructor.prototype, protoProps); if (staticProps) defineProperties(Constructor, staticProps); return Constructor; }; }();

window._classCallCheck = function(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }

window._possibleConstructorReturn = function(self, call) { if (!self) { throw new ReferenceError("this hasn't been initialised - super() hasn't been called"); } return call && (typeof call === "object" || typeof call === "function") ? call : self; }

window._inherits = function(subClass, superClass) { if (typeof superClass !== "function" && superClass !== null) { throw new TypeError("Super expression must either be null or a function, not " + typeof superClass); } subClass.prototype = Object.create(superClass && superClass.prototype, { constructor: { value: subClass, enumerable: false, writable: true, configurable: true } }); if (superClass) Object.setPrototypeOf ? Object.setPrototypeOf(subClass, superClass) : subClass.__proto__ = superClass; }

window._inheritsRenderTester = function (_Component) {
    window._inherits(RenderTester, _Component);

    function RenderTester(props) {
        _classCallCheck(this, RenderTester);

        var _this = _possibleConstructorReturn(this, (RenderTester.__proto__ || Object.getPrototypeOf(RenderTester)).call(this, props));

        _this.state = {
            "a": "yay"
        };
        return _this;
    }

    _createClass(RenderTester, [{
        key: "render",
        value: function render() {

            return React.createElement(
                "div",
                null,
                this.state.a
            );
        }
    }]);

    return RenderTester;
}(Component);

                    <h1>
                        {eval(result)}
                    </h1>

我想在JSX内渲染RenderTester，但是出现以下错误：

警告：函数作为React子元素无效。如果返回Component而不是从render返回，则可能会发生这种情况。或者也许您打算调用此函数而不是返回它。

Answer 1

我知道了。

1。将转译的代码设为字符串

let result = `window._createClass = function () { function defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ("value" in descriptor) descriptor.writable = true; Object.defineProperty(target, descriptor.key, descriptor); } } return function (Constructor, protoProps, staticProps) { if (protoProps) defineProperties(Constructor.prototype, protoProps); if (staticProps) defineProperties(Constructor, staticProps); return Constructor; }; }();

window._classCallCheck = function(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }

window._possibleConstructorReturn = function(self, call) { if (!self) { throw new ReferenceError("this hasn't been initialised - super() hasn't been called"); } return call && (typeof call === "object" || typeof call === "function") ? call : self; }

window._inherits = function(subClass, superClass) { if (typeof superClass !== "function" && superClass !== null) { throw new TypeError("Super expression must either be null or a function, not " + typeof superClass); } subClass.prototype = Object.create(superClass && superClass.prototype, { constructor: { value: subClass, enumerable: false, writable: true, configurable: true } }); if (superClass) Object.setPrototypeOf ? Object.setPrototypeOf(subClass, superClass) : subClass.__proto__ = superClass; }

window._inheritsRenderTester = function (_Component) {
    window._inherits(RenderTester, _Component);

    function RenderTester(props) {
        _classCallCheck(this, RenderTester);

        var _this = _possibleConstructorReturn(this, (RenderTester.__proto__ || Object.getPrototypeOf(RenderTester)).call(this, props));

        _this.state = {
            "a": "yay"
        };
        return _this;
    }

    _createClass(RenderTester, [{
        key: "render",
        value: function render() {

            return React.createElement(
                "div",
                null,
                this.state.a
            );
        }
    }]);

    return RenderTester;
}(Component);`

2。评估

                    let evaluated = eval(result)

3。创建一个实例。

                    let dynamicComponent = new evaluated();

4。在jsx表达式中调用渲染函数

                    <h1>
                        {dynamicComponent.render()}
                    </h1>

如何在jsx中编写react.createElement（）代码？

1 个答案: