js数组方法的总结 ：1、队尾插入push，2、队尾删除并返回删除的最后一项pop，3、队首插入unshift()，4、队首删除shift()，5、数组一添加数组二concat()
1、队尾插入push
var colors = ["red","green"];
colors.push("black"):
console.log(colors); //["red","green","black"]2、队尾删除并返回删除的最后一项pop
var colors = ["red","green","black"]; var item = colors.pop(); console.log(item); //"black"
3、队首插入unshift()
var colors = ["red","green"];
colors.unshift("black");
var item = colors.pop();
console.log(item); //"black"4、队首删除shift()
var colors = ["red","green","black"]; colors.shift(); console.log(colors); //["green","black"]
5、数组一添加数组二concat()
var colors = ["red","green","black"];
var colors2 = colors.concat("yellow",["blue","brown"]);
console.log(colors); //["red","green","black"]
console.log(colors2); //["red","green","black","yellow","blue","brown"]6、数组的截取slice()
只传一个参数：从数组这个参数的下标开始截取一直到数组结束。
var colors = ["red","green","black"]; colors.slice(1); //["green","black"] console.log(colors); //["red","green","black"]
传两个参数：第一个是截取开始的位置，第二个是截取结束的位置
var colors = ["red","green","black","yellow","blue","brown"]; colors.slice(1,3)//从位置1开始，到位置2结束["green","black"];
7、数组的splice()方法
有三种用法：
删除：可以删除任意数量的项，只需指定两个参数：第一个参数为删除开始的位置，第二个参数为删除项数。
插入：可以向指定位置插入任意数量的项，只需提供3个参数：起始位置、0（要删除的项数）和要插入的项。例如：splice（2,0,"red","green")，会从当前数组的位置2开始插入字符串"red"和"green"。
替换: 可以向指定位置插入任意数量的项，且同事删除任意数量的项，只需提供3个参数：起始位置、要删除的项数和要插入的任意数量的项。插入的项数不必与删除项数相等。例如：splice (2,1,"red","green") 会删除当前数组位置2的项，然后再从位置2开始插入字符串。
var colors = ["red","green","black"];
var removed = colors.splice(0,1);
console.log(colors); //["green","black"]
console.log(removed); //["red"]
removed = colors.splice(1,0,"yellow","orange");
console.log(colors); //["green","yellow","orange","black"]
console.log(removed); //[]
removed = colors.splice(1,1,"red","purple");
console.log(colors); //["green","red","purple","orange","black"]
console.log(removed); //["yellow"]8、位置方法indexOf()和lastIndexOf()
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