Arithmetic operators for JavaScript

Source: Internet
Author: User
Tags arithmetic operators

ECMAScript defines 5 arithmetic operators, plus, minus, multiply, divide, and modulo (take-up). If the value of the arithmetic operation is not numeric, then the background will first convert it to a numeric value (implicit conversion) using the number () transformation function.

One, addition

varbox = 1 + 2;//equals 3    varbox = 1 + NaN;//Nan, as long as one nan is Nan    varbox = Infinity + Infinity;//Infinity    varbox =-infinity +-infinity;//-infinity    varbox = Infinity +-infinity;//Nan, positive infinity and negative infinity addition, etc. nan    varbox = 100 + ' 100 ';//100100, String connector, string is not an addition    varbox = ' Your age is: ' + 10 + 20;//your age is: 1020, converted to string    varbox = 10 + 20 + ' is your age ';//30 is your age and has not been turned into a string    varbox = ' Your age is: ' + (10 + 20);//your age is: 30, not converted into a string    varbox = 10 + {}//10[object Object], the last type is a string type, and if there is toString () or valueOf () returns the value of the + + return number   varBox =10+{toString:function(){          return100; }} alert (box);// the

Second, subtraction

varbox = 100-70;//equals    varbox =-100-70//equals -170    varbox =-100--70//-30, generally written-100-(-70) relatively clear    varbox = 1-nan;//Nan, as long as one nan is Nan    varbox = infinity-infinity;//NaN    varbox =-infinity--infinity;//NaN    varbox = Infinity--infinity;//Infinity    varbox =-infinity-infinity;//-infinity    varbox = 100-true;//99,true turns into a value of 1    varbox = 100-";//100, ' turned into 0 results or    varbox = 100-' 70 ';//30, ' 70 ' turns into a value of    varbox = 100-NULL;//100,null turned 0.    varbox =-' Lee ';//Nan,lee turned into NaN.    varbox = 100-{};//NaN, if there is toString () or valueOf () returns 100-the value of the return number    varbox = 100-{toString:function(){          return10;    }    }; alert (box);

Third, multiplication

     varbox = 100 * 70;//7000    varbox = * NaN;//Nan, as long as there is a nan that is Nan    varbox = Infinity * Infinity;//Infinity    varbox =-infinity * Infinity;//-infinity    varbox =-infinity *-infinity;//Infinity    varbox = 100 *true;//100,true turns into a value of 1    varbox = 100 * ";//0, "turned 0."    varbox = 100 *NULL;//0,null turned 0.    varbox = * ' Lee ';//Nan,lee turned into NaN.    varbox = 100 * {};//NaN, if there is toString () or valueOf () returns 100-the value of the return number

Iv. Division

     varbox = 100/70;//1.42 ....    varbox = 100/nan;//NaN    varbox = infinity/infinity;//NaN    varbox =-infinity/infinity;//NaN    varbox =-infinity/-infinity;//NaN    varbox = 100/true;//100,true turns into 1 .    varbox = 100/';//Infinity, divide two numbers, the second number cannot be 0    varbox = 100/NULL;//Infinity,    varbox = +/' Lee ';//NaN    varbox = 100/{};//NaN, if there is toString () or valueOf () returns the value of 100/return number

Five, to find a model

     varbox = 10 3;//1, the remainder is 1    varbox =% NaN;//NaN    varbox = Infinity% Infinity;//NaN    varbox =-infinity% Infinity;//NaN    varbox =-infinity%-infinity;//NaN    varbox = 100true;//0    varbox = 100 ';//NaN    varbox = 100NULL;//NaN    varbox =% ' Lee ';//NaN    varbox = 100 {};//NaN, if there is toString () or valueOf () returns a value of 100 of the returned number

Arithmetic operators for JavaScript

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