定义数组方式：var array = new Array();var array = Array();var array = ["one", "two", "three"]; var array = []; 数组检测：value instanceof ArrayArray.isArray(value) //IE9+,Firefox 4+,Safari 5+ ,Opera 10.5+,Chrome转换方式：var array = ["one", "two", "three"]; array.toString();array.valueOf();array.join(',');//随便一个分隔字符array.toLocaleString(); //最好不要使用此方法，转换结果有可能根据代码或者浏览器版本返回不一样的结果栈方法：push向数组末尾压入一项，pop向数组末尾弹出一项；var array = ["two", "three"]; array.push("one"); //array = ["two","three","one"]var item = array.pop(); //array=["two","three"];item="one";队列方式：unshift向数组前端压入，shift向数组前端弹出var array = ["one","two", "three"]; var item = array.shift(); //array = ["two","three"]; item = "one";array.unshift("one"); //array=["one","two","three"];排序方法：var array = new Array();array.sort();//正向排序array.reverse(); //反向排序array.sort(fn);//fn返回0，-1,1示例：function compare(value1, value2) { if (value1 < value2) { return -1; } else if (value1 > value2) { return 1; } else { return 0; } } var values = [0, 1, 5, 10, 15]; values.sort(compare); alert(values); //0,1,5,10,15操作方法：concat 用法var colors = ["red", "green", "blue"]; var colors2 = colors.concat("yellow", ["black", "brown"]); alert(colors); //red,green,blue alert(colors2); //red,green,blue,yellow,black,brownslice 用法var colors = ["red", "green", "blue", "yellow", "purple"]; var colors2 = colors.slice(1); var colors3 = colors.slice(1,4); alert(colors2); //green,blue,yellow,purple alert(colors3); //green,blue,yellowsplice 用法var colors = ["red", "green", "blue"]; var removed = colors.splice(0,1); //remove the first item alert(colors); //green,blue alert(removed); //red - one item array removed = colors.splice(1, 0, "yellow", "orange"); //insert two items at position 1 alert(colors); //green,yellow,orange,blue alert(removed); //empty array removed = colors.splice(1, 1, "red", "purple"); //insert two values, remove one alert(colors); //green,red,purple,orange,blue alert(removed); //yellow - one item array数组搜索//IE9+,Firefox 4+,Safari 5+ ,Opera 10.5+,Chrome var numbers = [1,2,3,4,5,4,3,2,1]; alert(numbers.indexOf(4)); //3 alert(numbers.lastIndexOf(4)); //5 alert(numbers.indexOf(4, 4)); //5 alert(numbers.lastIndexOf(4, 4)); //3 var person = { name: "Nicholas" }; var people = [{ name: "Nicholas" }]; var morePeople = [person]; alert(people.indexOf(person)); //-1 alert(morePeople.indexOf(person)); //0迭代方式//IE9+,Firefox 4+,Safari 5+ ,Opera 10.5+,Chrome ; every(),filter(),forEach(),map(),some();var numbers = [1,2,3,4,5,4,3,2,1]; var everyResult = numbers.every(function(item, index, array){ return (item > 2); }); alert(everyResult); //false var someResult = numbers.some(function(item, index, array){ return (item > 2); }); alert(someResult); //true var filterResult = numbers.filter(function(item, index, array){ return (item > 2); }); alert(filterResult); //[3,4,5,4,3]var mapResult = numbers.map(function(item, index, array){ return item * 2; }); alert(mapResult); //[2,4,6,8,10,8,6,4,2]归并方法：var values = [1,2,3,4,5]; var sum = values.reduce(function(prev, cur, index, array){ return prev + cur; }); alert(sum); var sum = values.reduceRight(function(prev, cur, index, array){ return prev + cur; }); alert(sum);函数call与apply的区别：call要指定参数逐个列举的构造，apply只需要指定两个参数 funcation sum(num1,num2){ return sum.call(this,num1,num2); } funcation sum(num1,num2){ return sum.apply(this,arguments);//return sum.apply(this,[num1,num2]); }递归防止方法名改变的方法：
function factorial(num1){
if(num<1){
return 1;
}else{
return arguments.callee.caller(num1-1);
}
}
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