window.postMessage.accountability1? I print out window.postMessage.length always = 2
window.postMessage.accountability1? I print out window.postMessage.length always = 2
window.postMessage is a function.
length is an attribute value of the function object, indicating how many parameters the function must pass in, that is, the number of formal parameters.
does not include . parameters, or parameters with default values. Function.prototype.length document
window.postMessage signature (where transfer is an optional parameter):
otherWindow.postMessage (message, targetOrigin, [transfer])
in fact, the number of formal parameters varies from browser to browser. Today you encounter a pit
so, use this property with caution
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