js去除数组重复项,删除重复数据的方法

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var arr = [3,3,1,6,7,4,4,1];

var o = {};

for(var i = 0; i < arr.length; i++)

{

o[arr[i]] = arr[i];

}

arr = [];

for (var el in o)

{

if (el == o[el])

arr.push(el - 0);

}

alert(arr);

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var clearRepeat=function(a){

var c=[],b={};

for(var i=0;i<a.length;i++){

if( ! b[0+a[i]]){

b[a[i]]=1;

c.push(a[i])

}

}

return c;

}

var a=[undefined,4,5,6,7,8,9,10,11,"aa","bb","aa","bb","$#@@","!*&^%%","$#@@","!*&^%%",0,"0"];

//请注意上面数组的0,"0"项目。是可以正常处理的。因为他们的数据类型不一样所以他不能算是重复项

var c=clearRepeat(a);

alert(c.join())

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Array.prototype.del = function() {

var a = {}, c = [], l = this.length;

for (var i = 0; i < l; i++) {

var b = this[i];

var d = (typeof b) + b;

if (a[d] === undefined) {

c.push(b);

a[d] = 1;

}

}

return c;

}

alert([1, 1, 2, 3, 4, 5, 4, 3, 4, 4, 5, 5, 6, 7].del());

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Array.prototype.unique = function(){

var o = {}, re = [];

for(var i=0, len = this.length;i<len; i++){

if(!o[this[i]]){

o[this[i]] = true;

re.push(this[i]);

}

}

return re;

}

var arr = [1,2,3,2,3,4,1,2,3,1,1,1,5,6];

console.log( arr.unique() );

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var arr = ["123","123","123","123","sfsdf","123","345","123","123","345","456","567","sdc"];

var str = [];

for(var i = 0,len = arr.length;i < len;i++){

!RegExp(arr[i],"g").test(str.join(",")) && (str.push(arr[i]));

}

alert(str);