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JavaScript Syntax (iii)

Source: Internet
Author: User
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Function: complete a specific function.

Four elements of a function: name, input, return value, processing.

Define function: function (definition) name (parameter) {function body (processing)}

text box plus button (call)

For example: Enter a year to determine if it is leap years

<body><input type=' Number'Id='N'Placeholder="Enter Year"/><input type="Button"Value="Judging"onclick="x ()"</body>function X () {varA=document.getelementbyid ('N'). Valueif(a!="')    {        varb=parsefloat (a)if(b%1==0)         {             if(b>0&&b<10000)             {                 if(b%4==0&&b% -!=0|| b% -==0) {alert ('you are entering a leap year')                  }                 Else{alert ('you have entered common year')                  }             }             Else{alert ('the year you entered is not in the correct format')              }         }         Else{alert ('you are not entering an integer')          }    }}</script>

JavaScript Syntax (iii)

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