How to use the "go" JS keyword in

Source: Internet
Author: User

How to use the JS keyword in the original address:

1.For ... In declares a loop/iterate operation for an array or an object's properties.

For An array , iterate over the array element , and for the object , iterate over the object's attributes;

JS Code
    1. var x
    2. var mycars = new Array ()
    3. Mycars[0] = "Saab"
    4. MYCARS[1] = "Volvo"
    5. MYCARS[2] = "BMW"
    6. for (x in mycars)
    7. {
    8. document.write (Mycars[x] + "<br/>")
    9. }

The output is:

Java code
    1. Saab
    2. Volvo
    3. BMW
Object Example: JS code
    1. var obj = {
    2. W: "Wen",
    3. J: "Jian",
    4. B: "Bao"
    5. }
    6. for (var v in obj) {
    7. document.write (v) +"<br/>";
    8. }
Output as: Java code
    1. W
    2. J
    3. B
2. Determine whether an object is an element/attribute of an array/object:Format: (variable in object) ... Attention

When an "object" is an array, "variable" refers to the "index" of the arrays;

When "Object" is an object, "variable" refers to the object's "Properties".

Examples of arrays:

JS Code
    1. var arr = ["A","B","2","3","str"];
    2. var result = ("b" in arr);
    3. var result1 = (4 in arr);
    4. document.write (result+"<br>");
    5. document.write (result1+"<br>");
Output as: Java code
    1. False
    2. True
Object Example: JS code
  1. var obj={
  2. W:"Wen",
  3. J:"Jian",
  4. B:"Bao"
  5. }
  6. var result= (2 in obj);
  7. var result1= ("J" in obj);
  8. document.write (Result) +"<br/>";
  9. document.write (RESULT1) +"<br/>";
Output as: Java code
    1. False
    2. True

How to use the "go" JS keyword in

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