复制代码 代码如下:

/****************************************************

*CreateBy:joe zhou

*CreateDate:2011-9-4

*Description:字符串辅助函数

****************************************************/

//String.prototype = {

// caption: function () {

// },

// leftPad: function (padChar, width) {

// if (this.length >= width) {

// return this;

// }

// }

//};

String.prototype.padLeft = function (padChar, width) {

var ret = this;

while (ret.length < width) {

if (ret.length + padChar.length < width) {

ret = padChar + ret;

}

else {

ret = padChar.substring(0, width-ret.length) + ret;

}

}

return ret;

};

String.prototype.padRight = function (padChar, width) {

var ret = this;

while (ret.length < width) {

if (ret.length + padChar.length < width) {

ret += padChar;

}

else {

ret += padChar.substring(0, width - ret.length);

}

}

return ret;

};

String.prototype.trim = function () {

return this.replace(/^s+/, '').replace(/s+$/, '');

};

String.prototype.trimLeft = function () {

return this.replace(/^s+/, '');

};

String.prototype.trimRight = function () {

return this.replace(/s+$/, '');

};

String.prototype.caption = function () {

if (this) {

return this.charAt(0).toUpperCase() + this.substr(1);

}

return this;

};

String.prototype.reverse = function () {

var ret = '';

for (var i = this.length - 1; i >= 0; i--) {

ret += this.charAt(i);

}

return ret;

};

String.prototype.startWith = function (compareValue, ignoreCase) {

if (ignoreCase) {

return this.toLowerCase().indexOf(compareValue.toLowerCase()) == 0;

}

return this.indexOf(compareValue) == 0

};

String.prototype.endWith = function (compareValue, ignoreCase) {

if (ignoreCase) {

return this.toLowerCase().lastIndexOf(compareValue.toLowerCase()) == this.length - compareValue.length;

}

return this.lastIndexOf(compareValue) == this.length - compareValue.length;

};