1.不存在跨域情况

<iframe  height="0px" id="outerPage" class= "outerPage" src="./test.html" onload="iframeload()"></iframe>
function iframeload() {
                                        setTimeout(() => {
                                            try {
                                                const cIframe = document.getElementById("outerPage");
                                                let aWindow = cIframe.contentWindow;
                                                let aWindowHeight =
                                                        aWindow .document.documentElement.scrollHeight ||
                                                        aWindow .document.body.scrollHeight;
        
                                                let doc = cIframe.contentDocument || cIframe.document;
                                                let cHeight = Math.max(
                                                        doc.body.clientHeight,
                                                        doc.documentElement.clientHeight
                                                );
                                                let sHeight = Math.max(
                                                        doc.body. scrollHeight,
                                                        doc.documentElement.scrollHeight
                                                );
                                                let lheight = Math.max(cHeight, sHeight);
                                                let finalHeight = Math.max(lheight, aWindowHeight );
                                                var acheight = window.innerHeight;//屏幕可视宽度
                                              console.log("sssss")
                                                if(finalHeight<acheight)
                                                    $(".outerPage").css("height",finalHeight)
                                                else
                                                    $(".outerPage").css("height",acheight) 
        
                                            } catch (e) {
                                                //跨域获取不到
                                                throw new Error("自定义错误setIframeHeight Error");
                                            }
                                        }, 1000);
                                    }

2.存在跨域情况 使用postmessage传值
(1)引入页面

<script type="text/javascript">

  var h = document.body.scrollHeight;
  window.parent.postMessage(h+"", '*');
</script>

(2)iframe页面

<iframe  height="0px" id="outerPage" class= "outerPage" src="http://192.168.1.22:8080/in.html" ></iframe>

        
 window.addEventListener('message', function (e) {
                    console.log(e.data);
                     document.getElementById('outerPage').style.height=e.data+"px" 
                }, false)