basis of javascript

    技术2022-05-20  52

    Javascript and Java are alike each other, including control statements and String object.

    All control statements such as  if, for, while, swith in java also emerge in javascript . 

     

    Code Example:

     var lines = new Array("hello", "world"); for(var i = 0; i < lines.length; i++){ document.write(lines[i] + "<br/>"); } equals to: for( line in lines){ docment.write(line + "<br/>"); }

     

     

     Javascript is a weaky typed language that implies variables maybe equal even their types are not same.code  example:

    1. var s="the " + 1 + "st". int variable is converted into string automaticly. 2. weaky typed equals '==' function fun(){ if("3.0"==3){ document.write("string 3.0 equals int 3:" + true); // string variable can concatenate boolean variable. }else{ document.write(false); } };

     

    type convention  parseInt/parseFloat.

    constant  const PI=3.14

     

     

     

     


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