JavaScript function eval ()

The function of the eval () function is to execute the string in the form of a script
For example:

<script type= "Text/javascript" >  var str = "Var name= ' Zhang San '";  eval (str);  document.write (name);  Output Zhang San </script>

Specific application scenarios:
Pass the server-side string parameters, according to the JS script execution
For example: a string such as "[10,20,30]" is passed by the server and can be used to parse the string into an array object using eval

<script type= "Text/javascript" >  var str = "[10,20,30]";  This is the string passed from the server to  var array = eval (str);   Parse the Array object and assign the value to the arrays variable for  (Var i=0;i<array.length;i++) {    document.write (array[i]+ "&nbsp;");  }  Output result (30</script>)

JavaScript function eval ()