跨域修改iframe页面内容

postMessage

该方法需要使用 JSON.stringify 将对象转为字符串.

// React
function IframeProxy(props) {
    handleLoad = (e) => {
        e.target.contentWindow.postMessage(JSON.stringify({
            iframe: `<iframe name="target" title="target" className="target" src="http://www.targetdomain.com/target.html" frameBorder="0" scrolling="no" style="width: 100%;height:100%"></iframe>`,
            includeStyle: `
                body {
                    background-color: yellow;
                }
                header {
                    display: none;
                }
                footer {
                    display: none;
                }
            `,
            includeScript: `
                window.addEventListener('load', function() {
                    alert(document.querySelector('body').innerHTML);
                });
            `,
            importStyle: `http://www.mydomain.com/assets/css/import.css`,
            importScript: `http://www.mydomain.com/assets/js/import.js`
        }), 'https://www.target.com');
    }

    return <iframe name="proxy" title="proxy" className="proxy" width="100%" height="100%" onLoad={handleLoad} src={`http://www.targetdomain.com/proxy.html?origin=${window.location.protocol}//${window.location.host}`} frameBorder="0" scrolling="no"></iframe>;
}