The problem of JavaScript causing page display and its solution

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For this problem and its solution, in the previous article also mentioned. Here again, explain the explanation:

For Html,xml,javascript is an interpreted language, which means that JavaScript accesses html,xml data, it must exist at parse time. For browsers, when data such as Html,xml is accepted, the side is interpreted casually into the execution display. This makes it possible that the data required for JavaScript execution is not mounted in the browser, and this can be an error. The solution is to put the JavaScript code that is executed after all the required data, that is, to execute the JavaScript code after the data is loaded!