The usage of postMessage in javascript
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PostMessage in javascript
The parent page, the child page, the two pages are not in the same domain, and the dialogue between them uses postMessage. The following are collectively referred to as pages F and C for convenience.
The click event of the C page button sends a message to the F page. The F page receives the message. The C page executes the logic LC,LC. The F page sends a message to the C page. The F page receives the message. The F page executes the logic LF. In a word, pages F and C communicate with each other.
It can be considered that
Similar to parent-child component communication in react.
C page js code: var btnObj = document.getElementById ('buttons'); btnObj.onclick = function () {var defaultAdData = {type:'advert', gameData: {adId:' 123'}}; window.parent.postMessage (JSON.stringify (defaultAdData),'*') / * I am the error code: var receiveMessage = function (event) {var datas = JSON.parse (event.data); if (datas.type = "adGivePrize" & & datas.givePrize) {alert ('click');}} window.addEventListener ("message", receiveMessage, false) * /} / * I am the correct code: var receiveMessage = function (event) {var datas = JSON.parse (event.data); if (datas.type = "adGivePrize" & & datas.givePrize) {alert ('click');}} window.addEventListener ("message", receiveMessage, false); * / F page js Code: var receiveMessage = function (event) {var datas = JSON.parse (event.data) If (datas.type = = "advert") {var postIframeData = {type:'adGivePrize', givePrize:true}; / / iframe sends messages ~ window.frames [0] .postMessage (JSON.stringify (postIframeData),'*');}} window.addEventListener ("message", receiveMessage, false)
In summary, this method provides communication between two unrelated pages, so that external projects or embedded iframe can communicate with each other.
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