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var a = parseFloat("12");
var b = parseInt("34");
var a = +("12");
var b = +("34");
var A = new Array(2);
A[0] = new Array(2);
A[1] = new Array(2);
A[0][0] = 1;
A[0][1] = 2;
A[1][0] = 2;
A[1][2] = 2;
var A = {};
A[[0, 0]] = 1;
A[[0, 1]] = 2;
A[[1, 0]] = 3;
A[[1, 2]] = 4;
var str = "a1b2c3d4e5f6g7h8i9j0k";
var match = str.match(/\d/g, str);
var msg = [];
for(var i = 0; i < match.length; i++) {
msg.push(match[i]);
}
alert(msg);
var str = "a1b2c3d4e5f6g7h8i9j0k";
var msg = [];
str.replace(/\d/g, function() {
msg.push(arguments[0]);
});
alert(msg);
var str = "a1b2c3d4e5f6g7h8i9j0k";
var msg = str.replace(/\D/g,'').split('');
alert(msg);
function pad(num, n) {
var len = num.toString().length;
while(len <n){
num = "0" + num;
len++;
}
return num;
}
alert(pad(3,6)); //000003
function pad(num, n) {
return (Math.pow(10,n)+num+'').substr(1); //缺点:位数长度有限,15位以内。
}
alert(pad(3,6)); //000003
function pad(num, n) {
y='00000000000000000000000000000'+num; //爱几个0就几个,自己够用就行
return y.substr(y.length-n);
}
alert(pad(3,6)); //000003
var test = 3.45;
alert(test>>>0);
var A = {};//创建了一个空对象
A[[0, 0]] = 1;//两个中括号?????
A[[0, 1]] = 2;
A[[1, 0]] = 3;
A[[1, 2]] = 4;