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The impact of JavaScript code placement on programs

Source: Internet
Author: User
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There are two places

For example:

This time the program is wrong because the JavaScript code is loaded before, so document.getElementById ("Ceshi") will get an error. This element cannot be found because the page is not loaded at this time.
In <body>, but the program is also wrong before the element you want to get
After the <p> element is placed, the program is correct
But if you use jquery or define the form of a function, you don't have to think about where the JavaScript code is placed. Like what
html>  
　　
　　
The impact of JavaScript code placement on programs

                

                    
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