The process of converting strings into numbers in Vue

Writing method:Number (variable name). For example:

var a="100";   //Stringalert(Number(a)+100);   //turn out200

Specific situation:

1. If the string is preceded by 0 or other symbols, JS will automatically ignore it.

For example:

var a="000100";
alert(Number(a));   //The result is 100var b="+100";
alert(Number(b));   //turn out100

2. If the string is empty or space, it will be converted to 0.

For example:

var a="";
alert(Number(a));    //turn out0

3. If true is converted to 1, false is converted to 0

For example:

var a=true;
alert(Number(a));   //The result is 1var b=false;
alert(Number(b));   //turn out0

4. If it is a function, object, json, undefined, it will be converted to NAN, indicating that it cannot be converted.

5. If it is an array

①Empty array, then convert to 0

For example:

var a=[""];
alert(Number(a));   //turn out0

② If the array has content to convert it into corresponding content, there cannot be too many, only one can be converted. If the array contains multiple elements, the result is NAN

For example:

var a=[1]
alert(Number(a));  //The result is 1var b=[1,2]
alert(Number(b));  //turn outNAN

6. If it is null, it will be converted to 0

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