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JScript Array对象的几个原型方法

发布时间:2019-09-12 18:23:58

Array.prototype.inArray = function (value) {

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

if (this[i] === value) {

return true;

}

}

return false;

};

Array.prototype.max = function(){

for (var i = 1, max = this[0]; i < this.length; i++){

if (max < this[i]) {

max = this[i];

}

return max;

};

Array.prototype.min = function(){

for (var i = 1, min = this[0]; i < this.length; i++){

if (min > this[i]) {

min = this[i];

}

return min;

};

Array.prototype.indexOf = function(p_var)

{

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

{

if (this[i] == p_var)

{

return(i);

}

}

return(-1);

}

Array.prototype.exists = function(p_var) {return(this.indexOf(p_var) != -1);}

Array.prototype.queue = function(p_var) {this.push(p_var)}

Array.prototype.dequeue = function() {return(this.shift());}

Array.prototype.removeAt = function(p_iIndex) {return this.splice(p_iIndex, 1);}

Array.prototype.remove = function(o)

{

var i = this.indexOf(o);

if (i>-1)

{

this.splice(i,1);

}

return (i>-1);

}

Array.prototype.clear = function()

{

var iLength = this.length;

for (var i=0; i < iLength; i++)

{

this.shift();

}

}

Array.prototype.addArray = function(p_a)

{

if (p_a)

{

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

{

this.push(p_a[i]);

}

}

}

Array.prototype.Unique = function()

{

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

{

if(typeof a[this[i]] == "undefined")

a[this[i]] = 1;

}

this.length = 0;

for(var i in a)

this[this.length] = i;

return this;

};

Array.prototype.indexOf = function(obj, fromIndex)

{

if (fromIndex == null)

{

fromIndex = 0;

}

else if (fromIndex < 0)

{

fromIndex = Math.max(0, this.length + fromIndex);

}

for (var i = fromIndex; i < this.length; i++)

{

if (this[i] === obj)

{

return i;

}

}

return-1;

};

Array.prototype.lastIndexOf = function(obj, fromIndex)

{

if (fromIndex == null)

{

fromIndex = this.length - 1;

}

else if (fromIndex < 0)

{

fromIndex=Math.max(0, this.length+fromIndex);

}

for (var i = fromIndex; i >= 0; i--)

{

if (this[i] === obj)

{

return i;

}

}

return -1;

};

Array.prototype.insertAt = function(o, i)

{

this.splice(i, 0, o);

};

Array.prototype.insertBefore = function(o, o2)

{

var i = this.indexOf(o2);

if (i == -1)

{

this.push(o);

}

else

{

this.splice(i, 0, o);

}

};

Array.prototype.remove = function(o)

{

var i = this.indexOf(o);

if (i != -1)

{

this.splice(i, 1);

}

};

Array.prototype.mm=function()

{

var a={}, m=0, n="";

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

a[this[i]]?++a[this[i]]:a[this[i]]=1;

for(i in a){m=Math.max(m, a[i]); if(m==a[i]) n=i;}

return {"variable": n, "times": m};

}

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