How to understand the problem of javascript form submit

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Simple validation is usually required before submitting the form. Suppose the js method is called validateCondition. There are two methods, each of which requires form to be used with the submit button, otherwise the validation method will not work. As follows:

1. The submit button is of button type

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In fact, the reason is: 2 this situation will trigger the onsubmit event of form, while 1 will not.

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