Basic specifications of JavaScript
As everyone knows, each programming language has its own coding standards. The following are the basic coding standards for JavaScript that I have compiled.
1. Do not declare multiple variables on the same line
var a = null;var b = 0;var c = undefined;123
2. Please use ===/!== to compare true/false or numerical values
var a = 1;var b = '2';
if(a === b){ console.log(a);
}else{ console.log(b);
}3. Use literals instead of new Array() This form
var arr = [];
4. Do not use global functions
5.Switch must Use the default branch
switch（num）{
case 1:
num++;
breake;
case 2:
num--;
breake;
case 3:
num = 0;
breake;
default:
num = 1;
}6. Functions should not sometimes have a return value and sometimes not (it is recommended to have a return value: undefined)
7. For loops and if statements must use curly braces
for（var i=0 ；i<10; i++）{
console.log(i);
}##8. The variables in the for in loop should use the var keyword to limit the scope, so as to avoid scope pollution
for(var i in obj){
console.log(obj);
}Related articles:
JavaScript Date (date) related knowledge and usage
Introduction to the use of JavaScript RegExp objects
About how to use JavaScript Array (array) object
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