What are the differences between equal signs and equal signs in javascript? _ basic knowledge

An equal sign is the function of assigning values. The main problem is the difference between two and three equal signs. Many friends may not know it, there is a good example in this article, which mainly describes the differences between the two. If you are interested, do not miss an equal sign, which is a value assignment, the main problem is the difference between two and three equal signs.
The difference between two equal signs and three equal signs in javaScript

In a word: = convert the type before comparison, = first judge the type, if not the same type, it is directly false.
===Indicates constant equals, and the two sides of the comparison must be absolutely the same

Alert (0 = ""); // true
Alert (0 = false); // true
Alert ("" = false); // true

Alert (0 = ""); // false
Alert (0 = false); // false
Alert ("" = false); // false

Let's start with =. This is relatively simple. The comparison rules are as follows:
1. If the types are different, [not equal]
2. If both are numerical values and the values are the same, [equal]; (! If at least one of them is NaN, [not equal]. (You can only use isNaN () to determine whether a value is NaN)
3. If both are strings and the characters at each position are the same, [equal]; otherwise [not equal].
4. If both values are true or false, [equal].
5. If both values reference the same object or function, [equal]; otherwise [not equal].
6. If both values are null or undefined, [equal].

Besides, the comparison rules are as follows:

1. If the two values are of the same type, the comparison rules are as follows:
2. If the two values have different types, they may be equal. Perform type conversion and comparison based on the following rules:
A. If one is null and the other is undefined, [equal].
B. if one is a string and the other is a numerical value, convert the string to a numerical value before comparison.
C. If any value is true, convert it to 1 for comparison. If any value is false, convert it to 0 for comparison.
D. If one is an object and the other is a value or string, convert the object to a base type value before comparison. Converts an object to a base type and uses its toString or valueOf method. Js core built-in class, will try valueOf prior to toString; the exception is Date, Date uses toString conversion. Non-js core objects (I don't know much about it)
E. Any other combinations (array, etc.) are [not equal].

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