2015.7.7js-07-2 (Basic)

1. Use modulo to calculate the time, seconds%60, you can get the remaining seconds

var s = 362;

var minute = parseint (s/60) + "min"//Get Points

var second = s%60 + "SEC"//Get seconds

var time = minute + second; 6 minutes, 2 seconds.

2. Ternary operators

var a = 12;

if (a%2 = = 0) {

Alert ("even");

}else{
Alert ("singular");

}

Condition? Statement 1 (TRUE): statement 2 (FALSE);

A%2==0?alert ("even"): alert ("singular");

3.json

var json ={a:12,b:5,c: "ABC"};

JSON does not have length, so the loop is used for the (var i in Fson);

for (var i in JSON) {

Alert ("+i+"-something: "+ json[i]);

}

4. Take non-inline style (only a single style, cannot take compound style such as: background)

1.IE:OBJ.CURRENTSTYLE[ATTR];

2.chrome,firefox:getcomputedstyle (Obj,false) [attr];

Packaging:

function GetStyle (obj,attr) {

if (Obj.currentstyle) {

alert (obj.currentstyle[attr);

}else{

Alert (getComputedStyle (Obj,false) [attr];

}

}

5. Arrays

var arr = [1,2,3,4,5];

1. Length can be used to set it

arr.length = 0; Empty array

2. Adding and removing arrays

Push (), added from the tail, Arr.push (6);

Unshift (), added from the head, Arr.unshift (6);

Delete

Pop (), removed from tail, arr.pop (); No parameters

Shift (), remove Arr.shift () from the head; No parameters

Splice is added at any location in the array, deleting

1.splice (beginning, length) Delete, Arr.splice (2,2); The

Insert

2.splice (starting point, 0, "a", "B")//starting at the second position insert a, a B [1,2,a,b,3,4,5]

Replace

3.splice (Start, length, add Element) Arr.splice (2,2, "a", "B"), remove 2 from Start 2, then add 2, equals replace

6.sort Array Sorting

var arr = [1,10,3,59,5,20];

function sort (num1,num2) {

if (Num1 < num2) {

return-1;

}else if (Num1 > Num2) {

return 1;

}else{
return 0;

}

}

2015.7.7js-07-2 (Basic)