1.数组操作时的push?

var a = [],b = [],c = [];
a.push([1,2]);
a.push([3,4]);
Array.prototype.push.apply(b,[1,2]);
Array.prototype.push.apply(b,[3,4]);
c.push(5,6);
c.push(7,8);

alert(a+'\n'+a.length+'\n'+a[0]);
alert(b+'\n'+b.length+'\n'+b[0]);
alert(c+'\n'+c.length+'\n'+c[0]);

?2.获得当前样式?

function getCurrentStyle(oElement, sProperty) {   
	if(oElement.currentStyle){   
		return oElement.currentStyle[sProperty];   
	}else if(window.getComputedStyle){   
		sProperty = sProperty.replace(/([A-Z])/g, "-$1").toLowerCase();   
		return window.getComputedStyle(oElement, null).getPropertyValue(sProperty);   
	}else{   
		return null;   
	}   
}

?3. 移动数组中元素位置

Array.prototype.moveComponent=function (s,t){
	if(s!=t) {
		var temp=this[s];
		this.splice(s,1);
		this.splice(t,0,temp);
	}
	return this;
}
var a=new Array(0,1,2,3,4,5,6,7);
alert(a);
alert(a.moveComponent(2,6));

?4.校验密码级别

var checkPassWord = function (string) {
    return string.replace(/^(?:(?=.{4})(?=.*([a-z])|.)(?=.*([A-Z])|.)(?=.*(\d)|.)(?=.*(\W)|.).*|.*)$/, "$1$2$3$4").length;

};

alert(checkPassWord("JS示例代码"));

?5.清除文件选择框中的内容?

<input type="file" id="file_choose" /><button onclick="clearf();">clear</button>

var clearf = function(){
    var dx = document.getElementById('file_choose');
    dx.value = '';
    if(document.selection){
        dx.select();
        document.selection.clear();
    }
};

<div id="d" onclick="alert(1)">&nbsp;</div>

window.onload = function () {
var d = document.getElementById('d');
	if (d.addEventListener) {
		d.addEventListener('click', function () {
			alert(2);
		}, false);
		var evt = document.createEvent('MouseEvents');
		evt.initEvent('click', true, true);
		d.dispatchEvent(evt);
	} else {
		d.attachEvent('onclick', function () {
			alert(3);
		});
		d.click();
	}
}

if(document.createRange){
 var range = document.createRange();
}else
 var range = document.body.createTextRange(); 

if(range.findText){
 while(range.findText("字符")){
  range.pasteHTML(range.text.fontcolor("#4499ee"));
  range.collapse(true);
 }
}else{ 
 var s,n;
 s = window.getSelection();
 while(window.find("字符")){
  
  var n = document.createElement("SPAN");
  n.style.color="#ff0000" 

  s.getRangeAt(0).surroundContents(n);
 }
}

?String.prototype.format=function()

{
  if(arguments.length==0) return this;
  for(var s=this, i=0; i<arguments.length; i++)
    s=s.replace(new RegExp("\\{"+i+"\\}","g"), arguments[i]);
  return s;
};?

10.获得页面中选中的字符串?

?function getSelectedText() {

    if (window.getSelection) {
        // This technique is the most likely to be standard