Convert HTML-formatted string to HtmlElement

The code is as follows:

<meta charset= "UTF-8" ><title>insert title Here</title>


1. If the script is placed in the head element, the DIV element has not been loaded when it is loaded, and the "document.getElementById (...) is empty or not an object" appears.
2, the above code in chrome in the normal branch, the output is 5, but in IE, the output is 0.
3, note that the definition of data in JS does not need to use [], otherwise it will be wrong.